.................................................
Cheetah 18XL Family:
.................................................
ST318404LW/LC
.................................................
ST39204LW/LC
.................................................
.................................................
Product Manual, Volume 1
.................................................
.................................................
Cheetah 18XL Family:
.................................................
ST318404LW/LC
.................................................
ST39204LW/LC
.................................................
.................................................
Product Manual, Volume 1
.................................................
© 2001 Seagate Technology LLC All rights reserved
Publication number: 75789506, Rev. G
October 2001
Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Technology LLC.
Cheetah, SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either trademarks or registered trademarks of
Seagate Technology LLC. Other product names are registered trademarks or trademarks of their owners.
Seagate reserves the right to change, without notice, product offerings or specifications. No part of this publication may be reproduced in any form without written permission of Seagate Technology LLC.
Revision status summary sheet
Revision
Date
Writer/Engineer
Sheets Affected
Rev. A
Rev. B
Rev. C
Rev. D
Rev. E
Rev. F
Rev. G
2/16/2000
02/06/2001
03/19/2001
04/12/2001
06/18/2001
07/30/2001
10/15/2001
L. Newman/B. Reynolds
K. Schweiss/B. Reynolds
K. Schweiss/B. Reynolds
K. Schweiss/B. Reynolds
K. Schweiss/B. Reynolds
K. Schweiss/B. Reynolds
K. Schweiss/B. Reynolds
1/1, v thru viii, 1-82.
4.
28.
4, 15, and 59.
4.
3 and 49.
38-40 and 51-54.
Notice.
Product Manual 75789506 is Volume 1 of a two-volume document with the SCSI interface information in
the SCSI Interface Product Manual, Volume 2, part number 75789509.
If you need the SCSI interface information, order the SCSI Interface Product Manual, Volume 2, part
number 75789509.
Cheetah 18XL Product Manual, Rev. G
v
Table of Contents
1.0
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.0
Applicable standards and reference documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1
Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.1
Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.2
Electromagnetic susceptibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2
Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3
Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
3
3
3
3
4
3.0
General description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1
Standard features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
Media characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3
Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4
Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5
Unformatted and formatted capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6
Programmable drive capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7
Factory installed accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8
Options (factory installed). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
7
7
7
7
8
8
8
8
4.0
Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1
Internal drive characteristics (transparent to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2
SCSI performance characteristics (visible to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.1
Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.2
Format command execution time (minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.3
Generalized performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.3
Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.4
Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.5
Cache operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.5.1
Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5.2
Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.0
Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1
Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.1
Environmental interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.2
Read errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.3
Write errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.4
Seek errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2
Reliability and service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2.1
Mean time between failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2.2
Field failure rate vs time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2.3
Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.4
Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.5
Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.6
Service tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.7
Hot plugging Cheetah 18XL disc drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2.8
S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.9
Drive Self Test (DST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.10
Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.0
Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1
AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2
DC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2.1
Conducted noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2.2
Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2.3
12 V - Current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3
Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4
Environmental limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4.1
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
21
21
22
22
22
25
27
27
vi
Cheetah 18XL Product Manual, Rev. G
6.5
6.4.2
Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
6.4.3
Effective altitude (sea level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
6.4.4
Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
6.4.5
Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
6.4.6
Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
6.4.7
Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
7.0
Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
7.1
Drive internal defects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
7.2
Drive error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
7.3
SCSI systems errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
8.0
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
8.1
Drive ID/option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
8.1.1
Notes for figures 15, 16, and 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
8.1.2
Function description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
8.2
Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
8.3
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
8.3.1
Air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
8.4
Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
8.5
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
9.0
Interface requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.1
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.2
SCSI interface messages supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.3
SCSI interface commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
9.3.1
Inquiry Vital Product data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
9.3.2
Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
9.4
SCSI bus conditions and miscellaneous features supported . . . . . . . . . . . . . . . . . . . . . . . . .55
9.5
Synchronous data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
9.5.1
Synchronous data transfer periods supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
9.5.2
REQ/ACK offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
9.6
Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
9.6.1
DC cable and connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
9.6.2
SCSI interface physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
9.6.3
SCSI interface cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
9.6.4
Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
9.7
Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
9.7.1
Multimode—SE and LVD alternatives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
9.8
Terminator requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
9.9
Terminator power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
9.10
Disc drive SCSI timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
9.11
Drive activity LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
10.0
Seagate Technology support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Cheetah 18XL Product Manual, Rev. G
vii
List of Figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Cheetah 18XL family drive (ST318404LC shown) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Cheetah 18XL family drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical ST318404 drive +12 V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Typical ST39204 drive +12 V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Typical ST318404 drive +5 V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
TypicalST39204 drive +5 V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
ST318404 DC current and power vs. input/output operations per second (SE) . . . . . . . . . . 25
ST318404 DC current and power vs. input/output operations per second (LVD) . . . . . . . . . 25
ST39204 DC current and power vs. input/output operations per second (SE) . . . . . . . . . . . 26
ST39204 DC current and power vs. input/output operations per second (LVD) . . . . . . . . . . 26
Locations of PCBA components listed in Table 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
ST318404LW mounting configuration dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
ST318404LC mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
J6 jumper header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
J5 jumper header (on LW models only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
J2 option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Air flow (suggested) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
LW model drive physical interface (68-pin J1 SCSI I/O connector) . . . . . . . . . . . . . . . . . . . . 57
LC model drive physical interface (80-pin J1 SCSI I/O connector) . . . . . . . . . . . . . . . . . . . . 57
SCSI daisy chain interface cabling for LW drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Nonshielded 68 pin SCSI device connector used on LW drives . . . . . . . . . . . . . . . . . . . . . . 61
Nonshielded 80 pin SCSI “SCA-2” connector, used on LC drives . . . . . . . . . . . . . . . . . . . . . 62
LVD output signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Typical SE-LVD alternative transmitter receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Cheetah 18XL Product Manual, Rev. G
1.0
1
Scope
This manual describes Seagate Technology® LLC Cheetah 18XL™ disc drives.
Cheetah 18XL drives support the Small Computer System Interface (SCSI) as described in the ANSI SCSI
interface specifications to the extent described in this manual. The SCSI Interface Product Manual, part number 75789509, describes general SCSI interface characteristics of this and other families of Seagate drives.
The SCSI Interface Product Manual references information from the documents listed in Section 2.3.
From this point on in this product manual the reference to Cheetah 18XL models is referred to as “the drive”
unless references to individual models are necessary.
Figure 1.
Cheetah 18XL family drive (ST318404LC shown)
2
Cheetah 18XL Product Manual, Rev. G
Cheetah 18XL Product Manual, Rev. G
2.0
3
Applicable standards and reference documentation
The drive has been developed as a system peripheral to the highest standards of design and construction. The
drive depends upon its host equipment to provide adequate power and environment in order to achieve optimum performance and compliance with applicable industry and governmental regulations. Special attention
must be given in the areas of safety, power distribution, shielding, audible noise control, and temperature regulation. In particular, the drive must be securely mounted in order to guarantee the specified performance characteristics. Mounting by bottom holes must meet the requirements of Section 8.4.
2.1
Standards
The Cheetah 18XL family complies with Seagate standards as noted in the appropriate sections of this Manual
and the Seagate SCSI Interface Product Manual, part number 75789509.
The Cheetah 18XL disc drive is a UL recognized component per UL1950, CSA certified to CSA C22.2 No. 95095, and VDE certified to VDE 0805 and EN60950.
2.1.1
Electromagnetic compatibility
The drive, as delivered, is designed for system integration and installation into a suitable enclosure prior to use.
As such the drive is supplied as a subassembly and is not subject to Subpart B of Part 15 of the FCC Rules
and Regulations nor the Radio Interference Regulations of the Canadian Department of Communications.
The design characteristics of the drive serve to minimize radiation when installed in an enclosure that provides
reasonable shielding. As such, the drive is capable of meeting the Class B limits of the FCC Rules and Regulations of the Canadian Department of Communications when properly packaged. However, it is the user’s
responsibility to assure that the drive meets the appropriate EMI requirements in their system. Shielded I/O
cables may be required if the enclosure does not provide adequate shielding. If the I/O cables are external to
the enclosure, shielded cables should be used, with the shields grounded to the enclosure and to the host controller.
2.1.2
Electromagnetic susceptibility
As a component assembly, the drive is not required to meet any susceptibility performance requirements. It is
the responsibility of those integrating the drive within their systems to perform those tests required and design
their system to ensure that equipment operating in the same system as the drive or external to the system
does not adversely affect the performance of the drive. See Section 5.1.1 and Table 2, DC power requirements.
2.2
Electromagnetic compliance
Seagate uses an independent laboratory to confirm compliance to the directives/standard(s) for CE Marking
and C-Tick Marking. The drive was tested in a representative system for typical applications. The selected system represents the most popular characteristics for test platforms. The system configurations include:
•
•
•
•
•
•
•
Typical current use microprocessor
3.5-inch floppy disc drive
Keyboard
Monitor/display
Printer
External modem
Mouse
Although the test system with this Seagate model complies to the directives/standard(s), we cannot guarantee
that all systems will comply. The computer manufacturer or system integrator shall confirm EMC compliance
and provide CE Marking and C-Tick Marking for their product.
Electromagnetic compliance for the European Union
If this model has the CE Marking it complies with the European Union requirements of the Electromagnetic
Compatibility Directive 89/336/EEC of 03 May 1989 as amended by Directive 92/31/EEC of 28 April 1992 and
Directive 93/68/EEC of 22 July 1993.
4
Cheetah 18XL Product Manual, Rev. G
Australian C-Tick
If this model has the C-Tick Marking it complies with the Australia/New Zealand Standard AS/NZS3548 1995
and meets the Electromagnetic Compatibility (EMC) Framework requirements of Australia’s Spectrum Management Agency (SMA).
Korean MIC
If this model has the Korean Ministry of Information and Communication (MIC) logo, it complies with paragraph
1 of Article 11 of the Electromagnetic Compatibility (EMC) Control Regulation and meets the Electromagnetic
Compatibility Framework requirements of the Radio Research Laboratory (RRL) Ministry of Information and
Communication Republic of Korea.
This drive has been tested and complies with the Electromagnetic Interference/Electromagnetic Susceptibility
(EMI/EMS) for Class B products.
•
•
•
•
•
EUT name (model numbers): ST318404LC, ST318404LW, ST39204LC, ST39204LW
Certificate number: E-H011-00-5479 (B), E-H011-00-5478 (B), E-H011-00-5477 (B), E-H011-00-5476 (B)
Trade name or applicant: Seagate Technology International
Manufacturing start date: February 2000
Manufacturer/nationality: Singapore
Taiwanese BSMI
If this model has two Chinese words meaning “EMC certification” followed by an eight digit identification number, as a Marking, it complies with Chinese National Standard (CNS) 13438 and meets the Electromagnetic
Compatibility (EMC) Framework requirements of the Taiwanese Bureau of Standards, Metrology, and Inspection (BSMI).
2.3
Reference documents
Cheetah 18XL Installation Guide
Seagate P/N 75789507
Safety and Regulatory Agency Specifications
Seagate P/N 75789512
SCSI Interface Product Manual
Seagate P/N 75789509
Applicable ANSI Small Computer System Interface (SCSI) document numbers:
T10/1143D
Enhanced SCSI Parallel Interface (EPI)
T10/1236D
Primary Commands-2 (SPC-2)
T10/996D
SCSI Block Commands (SBC)
T10/1157D
SCSI Architectural Model-2 (SAM-2)
T10/1302D
SCSI Parallel Interface (SPI-3)
SFF-8451, Specification for SCA-2 Unshielded Connections
Package Test Specification
Seagate P/N 30190-001 (under 100 lb.)
Package Test Specification
Seagate P/N 30191-001 (over 100 lb.)
Specification, Acoustic Test Requirements, and Procedures
Seagate P/N 30553-001
In case of conflict between this document and any referenced document, this document takes precedence.
Cheetah 18XL Product Manual, Rev. G
3.0
5
General description
Cheetah 18XL drives combine giant magnetoresistive (GMR) heads, partial response/maximum likelihood
(PRML) read channel electronics, embedded servo technology, and a wide Ultra160 SCSI interface to provide
high performance, high capacity data storage for a variety of systems including engineering workstations, network servers, mainframes, and supercomputers.
Ultra160 SCSI uses negotiated transfer rates. These transfer rates will occur only if your host adapter supports
these data transfer rates and is compatible with the required hardware requirements of the I/O circuit type. This
drive also operates at Ultra160 data transfer rates.
Table 1 lists the features that differentiate the two Cheetah 18XL models.
Table 1:
Drive model number vs. differentiating features
Model number
Number
of active
heads
ST318404LW
6
ST318404LC
Number of I/O
connector pins
Number of I/O
data bus bits
Data buffer
size (MB)
Single-ended (SE) and low
voltage differential (LVD)
68
16
4
6
Single-ended (SE) and low
voltage differential (LVD)
80
16
4
ST39204LW
3
Single-ended (SE) and low
voltage differential (LVD)
68
16
4
ST39204LC
3
Single-ended (SE) and low
voltage differential (LVD)
80
16
4
[1]
I/O circuit type [1]
See Section 9.6 for details and definitions.
The drive records and recovers data on approximately 3.3-inch (84 mm) non-removable discs.
The drive supports the Small Computer System Interface (SCSI) as described in the ANSI SCSI interface
specifications to the extent described in this manual (Volume 1), which defines the product performance characteristics of the Cheetah 18XL family of drives, and the SCSI Interface Product Manual, part number
75789509, which describes the general interface characteristics of this and other families of Seagate SCSI
drives.
The drive’s interface supports multiple initiators, disconnect/reconnect, and automatic features that relieve the
host from the necessity of knowing the physical characteristics of the targets (logical block addressing is used).
The head and disc assembly (HDA) is sealed at the factory. Air circulates within the HDA through a nonreplaceable filter to maintain a contamination-free HDA environment.
Refer to Figure 2 for an exploded view of the drive. This exploded view is for information only—never disassemble the HDA and do not attempt to service items in the sealed enclosure (heads, media, actuator, etc.) as this
requires special facilities. The drive contains no replaceable parts. Opening the HDA voids your warranty.
Cheetah 18XL drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the landing
zone when power is removed.
An automatic shipping lock prevents potential damage to the heads and discs that results from movement during shipping and handling. The shipping lock automatically disengages when power is applied to the drive and
the head load process begins.
Cheetah 18XL drives decode track 0 location data from the servo data embedded on each surface to eliminate
mechanical transducer adjustments and related reliability concerns.
6
Cheetah 18XL Product Manual, Rev. G
A high-performance actuator assembly with a low-inertia, balanced, patented, straight-arm design provides
excellent performance with minimal power dissipation.
Figure 2.
Cheetah 18XL family drive
Cheetah 18XL Product Manual, Rev. G
3.1
7
Standard features
The Cheetah 18XL family has the following standard features:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Integrated Ultra160 SCSI controller
Multimode SCSI drivers and receivers—single-ended (SE) and low voltage differential (LVD)
16 bit I/O data bus
Asynchronous and synchronous data transfer protocol
Firmware downloadable via SCSI interface
Selectable even byte sector sizes from 512 to 4,096 bytes/sector
Programmable sector reallocation scheme
Flawed sector reallocation at format time
Programmable auto write and read reallocation
Reallocation of defects on command (post format)
Enhanced ECC maximum burst correction length of 240 bits with a guaranteed burst correction length of 233
bits.
Sealed head and disc assembly
No preventative maintenance or adjustment required
Dedicated head landing zone
Embedded servo design
Self diagnostics performed when power is applied to the drive
1:1 Interleave
Zoned bit recording (ZBR)
Vertical, horizontal, or top down mounting
Dynamic spindle brake
4,096 kbyte data buffer
Hot plug compatibility (Section 9.6.4.2 lists proper host connector needed) for “LC” model drives
Drive Self Test (DST)
3.2
Media characteristics
The media used on the drive has a diameter of approximately 3.3 inches (84 mm). The aluminum substrate is
coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability
and environmental protection.
3.3
•
•
•
•
•
•
Supports industry standard Ultra160 SCSI interface
Programmable multi-segmentable cache buffer (see Section 3.1)
10,033 RPM spindle. Average latency = 2.99 ms
Command queuing of up to 64 commands
Background processing of queue
Supports start and stop commands (spindle stops spinning)
3.4
•
•
•
•
•
Performance
Reliability
1,200,000 hour MTBF
LSI circuitry
Balanced low mass rotary voice coil actuator
Incorporates industry-standard Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.)
5-year warranty
8
Cheetah 18XL Product Manual, Rev. G
3.5
Unformatted and formatted capacities
Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per
sector. The following table shows the standard OEM model capacities:
Formatted
data block size
512 bytes/sector [1]
ST318404
ST39204
222EE55h (18.352 GB) [2]
111772Ah (9.176 GB) [2]
Notes.
[1]
[2]
3.6
Sector size selectable at format time. Users having the necessary equipment may modify the data block
size before issuing a format command and obtain different formatted capacities than those listed. See
Mode Select command and Format command in the SCSI Interface Product Manual, part number
75789509.
User available capacity depends on spare reallocation scheme selected, the number of data tracks per
sparing zone, and the number of alternate sectors (LBAs) per sparing zone.
Programmable drive capacity
Using the Mode Select command, the drive can change its capacity to something less than maximum. See the
Mode Select Parameter List table in the SCSI Interface Product Manual, part number 75789509. Refer to the
Parameter list block descriptor number of blocks field. A value of zero in the number of blocks field indicates
that the drive shall not change the capacity it is currently formatted to have. A number in the number of blocks
field that is less than the maximum number of LBAs changes the total drive capacity to the value in the block
descriptor number of blocks field. A value greater than the maximum number of LBAs is rounded down to the
maximum capacity.
3.7
Factory installed accessories
OEM Standard drives are shipped with the Cheetah 18XL Installation Guide, part number 75789507, and the
Safety and Regulatory Agency Specifications, part number 75789512, unless otherwise specified. The factory
also ships with the drive a small bag of jumper plugs used for the J2, J5, and J6 option select jumper headers.
3.8
Options (factory installed)
All customer requested options are incorporated during production or packaged at the manufacturing facility
before shipping. Some of the options available are (not an exhaustive list of possible options):
• Other capacities can be ordered depending on sparing scheme and sector size requested.
• Single unit shipping pack. The drive is normally shipped in bulk packaging to provide maximum protection
against transit damage. Units shipped individually require additional protection as provided by the single unit
shipping pack. Users planning single unit distribution should specify this option.
• The Cheetah 18XL Installation Guide, part number 75789507, is usually included with each standard OEM
drive shipped, but extra copies may be ordered.
• The Safety and Regulatory Agency Specifications, part number 75789512, is usually included with each
standard OEM drive shipped, but extra copies may be ordered.
Cheetah 18XL Product Manual, Rev. G
9
4.0
Performance characteristics
4.1
Internal drive characteristics (transparent to user)
Drive capacity
Read/write heads
Bytes/track
Bytes/surface
Tracks/surface (total)
Tracks/inch
Peak bits/inch
Internal data rate
Disc rotational speed
Average rotational latency
4.2
ST318404
ST39204
18.352
6
203,008
3,058
14,384
18,145
339
285-424
10,033
2.99
9.176
3
203,008
3,058
14,384
18,145
339
285-424
10,033
2.99
GByte (formatted, rounded off values)
Bytes (average, rounded off values)
Mbytes (unformatted, rounded off values)
Tracks (user accessible)
TPI
KBPI
Mbits/sec (variable with zone)
r/min (+0.5%)
msec
SCSI performance characteristics (visible to user)
The values given in Section 4.2.1 apply to all models of the Cheetah 18XL family unless otherwise specified.
Refer to Section 9.10 and to the SCSI Interface Product Manual, part number 75789509, for additional timing
details.
4.2.1
Access time [5]
Including controller overhead
(without disconnect) [1] [3]
Not including controller overhead
(without disconnect) [1] [3]
Drive level
Drive level
Read
Write
Read
msec
Average
– Typical [2]
Single Track – Typical [2]
Full Stroke – Typical [2]
4.2.2
5.4
0.8
10.2
6.0
1.1
11.2
5.2
0.6
10.0
5.8
0.9
11.0
Format command execution time (minutes) [1]
ST318404
ST39204
25
12
13
6
Maximum (with verify)
Maximum (no verify)
4.2.3
Write
msec
Generalized performance characteristics
Minimum sector interleave
1 to 1
Data buffer transfer rate to/from disc media (one 512-byte sector):
Min. [3]*
Avg. [3]
Max. [3]
26
33
40
MByte/sec
MByte/sec
MByte/sec
SCSI interface data transfer rate (asynchronous):
Maximum instantaneous one byte wide
Maximum instantaneous two bytes wide
5.0 Mbytes/sec [4]
10.0 Mbytes/sec [4]
Synchronous formatted transfer rate
In single-ended (SE) interface mode
In low voltage differential (LVD) interface mode
Ultra2 SCSI
5.0 to 40 Mbytes/sec
5.0 to 80 Mbytes/sec
Ultra160 SCSI
5.0 to 80 Mbytes/sec
5.0 to 160 Mbytes/sec
10
Cheetah 18XL Product Manual, Rev. G
Sector Sizes:
Default
512 byte user data blocks
Variable
512 to 4,096 bytes per sector in even number of bytes per sector.
If n (number of bytes per sector) is odd, then n-1 will be used.
Read/write consecutive sectors on a track
Yes
Flaw reallocation performance impact (for flaws reallocated at format time using
the spare sectors per sparing zone reallocation scheme.)
Negligible
Average rotational latency
2.99 msec
Notes for Section 4.2.
[1]
[2]
[3]
[4]
[5]
4.3
Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the
request for a Status Byte Transfer to the Initiator (excluding connect/disconnect).
Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives.
Assumes no errors and no sector has been relocated.
Assumes system ability to support the rates listed and no cable loss.
Access time = controller overhead + average seek time.
Access to data = controller overhead + average seek time + latency time.
Start/stop time
After DC power at nominal voltage has been applied, the drive becomes ready within 20 seconds if the Motor
Start Option is disabled (i.e. the motor starts as soon as the power has been applied). If a recoverable error
condition is detected during the start sequence, the drive executes a recovery procedure which may cause the
time to become ready to exceed 20 seconds. During spin up to ready time the drive responds to some commands over the SCSI interface in less than 3 seconds after application of power. Stop time is less than 15 seconds from removal of DC power.
If the Motor Start Option is enabled, the internal controller accepts the commands listed in the SCSI Interface
Product Manual less than 3 seconds after DC power has been applied. After the Motor Start Command has
been received the drive becomes ready for normal operations within 16 seconds typically (excluding an error
recovery procedure). The Motor Start Command can also be used to command the drive to stop the spindle
(see SCSI Interface Product Manual, part number 75789509).
There is no power control switch on the drive.
4.4
Prefetch/multi-segmented cache control
The drive provides prefetch (read look-ahead) and multi-segmented cache control algorithms that in many
cases can enhance system performance. “Cache” as used herein refers to the drive buffer storage space when
it is used in cache operations. To select prefetch and cache features the host sends the Mode Select command
with the proper values in the applicable bytes in Mode Page 08h (see SCSI Interface Product Manual, part
number 75789509). Prefetch and cache operation are independent features from the standpoint that each is
enabled and disabled independently via the Mode Select command. However, in actual operation the prefetch
feature overlaps cache operation somewhat as is noted in Section 4.5.1 and 4.5.2.
All default cache and prefetch Mode parameter values (Mode Page 08h) for standard OEM versions of this
drive family are given in Tables 8 and 9.
4.5
Cache operation
In general, 3,600 Kbytes of the physical buffer space in the drive can be used as storage space for cache operations. The buffer can be divided into logical segments (Mode Select Page 08h, byte 13) from which data is
read and to which data is written. The drive maintains a table of logical block disk medium addresses of the
data stored in each segment of the buffer. If cache operation is enabled (RCD bit = 0 in Mode Page 08h, byte 2,
bit 0. See SCSI Interface Product Manual, part number 75789509), data requested by the host with a Read
Cheetah 18XL Product Manual, Rev. G
11
command is retrieved from the buffer (if it is there), before any disc access is initiated. If cache operation is not
enabled, the buffer (still segmented with required number of segments) is still used, but only as circular buffer
segments during disc medium read operations (disregarding Prefetch operation for the moment). That is, the
drive does not check in the buffer segments for the requested read data, but goes directly to the medium to
retrieve it. The retrieved data merely passes through some buffer segment on the way to the host. On a cache
miss, all data transfers to the host are in accordance with buffer-full ratio rules. On a cache hit the drive ignores
the buffer-full ratio rules. See explanations associated with Mode page 02h (disconnect/reconnect control) in
the SCSI Interface Product Manual.
The following is a simplified description of a read operation with cache operation enabled:
Case A - A Read command is received and the first logical block (LB) is already in cache:
1. Drive transfers to the initiator the first LB requested plus all subsequent contiguous LBs that are already in
the cache. This data may be in multiple segments.
2. When the requested LB is reached that is not in any cache segment, the drive fetches it and any remaining
requested LBs from the disc and puts them in a segment of the cache. The drive transfers the remaining
requested LBs from the cache to the host in accordance with the disconnect/reconnect specification mentioned above.
3. If the prefetch feature is enabled, refer to Section 4.5.2 for operation from this point.
Case B - A Read command requests data, the first LB of which is not in any segment of the cache:
1. The drive fetches the requested LBs from the disc and transfers them into a segment, and from there to the
host in accordance with the disconnect/reconnect specification referred to in case A.
2. If the prefetch feature is enabled, refer to Section 4.5.2 for operation from this point.
Each buffer segment is actually a self-contained circular storage area (wrap-around occurs), the length of
which is an integer number of disc medium sectors. The wrap-around capability of the individual segments
greatly enhances the buffer’s overall performance as a cache storage, allowing a wide range of user selectable
configurations, which includes their use in the prefetch operation (if enabled), even when cache operation is
disabled (see Section 4.5.2). The number of segments may be selected using the Mode Select command, but
the size can not be directly selected. Size is selected only as a by-product of selecting the segment number
specification. The size in Kbytes of each segment is not reported by the Mode Sense command page 08h,
bytes 14 and 15. The value 0x0000 is always reported. If a size specification is sent by the host in a Mode
Select command (bytes 14 and 15) no new segment size is set up by the drive, and if the STRICT bit in Mode
page 00h (byte 2, bit 1) is set to one, the drive responds as it does for any attempt to change unchangeable
parameters (see SCSI Interface Product Manual, part number 75789509). The drive supports operation of any
integer number of segments from 1 to 32. The default number of segments is defined in Tables 8 and 9.
4.5.1
Caching write data
Write caching is a write operation by the drive that makes use of a drive buffer storage area where the data to
be written to the medium is stored in one or more segments while the drive performs the write command.
If read caching is enabled (RCD=0), then data written to the medium is retained in the cache to be made available for future read cache hits. The same buffer space and segmentation is used as set up for read functions.
The buffer segmentation scheme is set up or changed independently, having nothing to do with the state of
RCD. When a write command is issued, if RCD=0, the cache is first checked to see if any logical blocks that
are to be written are already stored in the cache from a previous read or write command. If there are, the
respective cache segments are cleared. The new data is cached for subsequent Read commands.
If the number of write data logical blocks exceeds the size of the segment being written into, when the end of
the segment is reached, the data is written into the beginning of the same cache segment, overwriting the data
that was written there at the beginning of the operation. However, the drive does not overwrite data that has not
yet been written to the medium.
If write caching is enabled (WCE=1), then the drive may return GOOD status on a write command after the
data has been transferred into the cache, but before the data has been written to the medium. If an error occurs
while writing the data to the medium, and GOOD status has already been returned, a deferred error will be
generated.
12
Cheetah 18XL Product Manual, Rev. G
The Synchronize Cache command may be used to force the drive to write all cached write data to the medium.
Upon completion of a Synchronize Cache command, all data received from previous write commands will have
been written to the medium.
Tables 8 and 9 show Mode default settings for the drives.
4.5.2
Prefetch operation
If the Prefetch feature is enabled, data in contiguous logical blocks on the disc immediately beyond that which
was requested by a Read command can be retrieved and stored in the buffer for immediate transfer from the
buffer to the host on subsequent Read commands that request those logical blocks (this is true even if cache
operation is disabled). Though the prefetch operation uses the buffer as a cache, finding the requested data in
the buffer is a prefetch hit, not a cache operation hit. Prefetch is enabled using Mode Select page 08h, byte 12,
bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch. Since data that is prefetched replaces data
already in some buffer segment(s), the host can limit the amount of prefetch data to optimize system performance. The max prefetch field (bytes 8 and 9) limits the amount of prefetch. The drive does not use the
Prefetch Ceiling field (bytes 10 and 11).
During a prefetch operation, the drive crosses a cylinder boundary to fetch more data only if the Discontinuity
(DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h.
Whenever prefetch (read look-ahead) is enabled (enabled by DRA = 0), it operates under the control of ARLA
(Adaptive Read Look-Ahead). If the host uses software interleave, ARLA enables prefetch of contiguous blocks
from the disc when it senses that a prefetch hit will likely occur, even if two consecutive read operations were
not for physically contiguous blocks of data (e.g., “software interleave”). ARLA disables prefetch when it
decides that a prefetch hit will not likely occur. If the host is not using software interleave, and if two sequential
read operations are not for contiguous blocks of data, ARLA disables prefetch, but as long as sequential read
operations request contiguous blocks of data, ARLA keeps prefetch enabled.
Cheetah 18XL Product Manual, Rev. G
5.0
13
Reliability specifications
The following reliability specifications assume correct host/drive operational interface, including all interface
timings, power supply voltages, environmental requirements and drive mounting constraints (see Section 8.4).
Seek Errors
Less than 10 in 108 seeks
Read Error Rates [1]
Recovered Data
Unrecovered Data
Miscorrected Data
MTBF
Service Life
Preventive Maintenance
Less than 10 errors in 1012 bits transferred (OEM default settings)
Less than 1 sector in 1015 bits transferred (OEM default settings)
Less than 1 sector in 1021 bits transferred
1,200,000 hours
5 years
None required
Note.
[1]
Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.
5.1
Error rates
The error rates stated in this specification assume the following:
• The drive is operated per this specification using DC power as defined in this manual (see Section 6.2).
• The drive has been formatted with the SCSI FORMAT command.
• Errors caused by media defects or host system failures are excluded from error rate computations. Refer to
Section 3.2, “Media Characteristics.”
• Assume random data.
5.1.1
Environmental interference
When evaluating systems operation under conditions of Electromagnetic Interference (EMI), the performance
of the drive within the system shall be considered acceptable if the drive does not generate an unrecoverable
condition.
An unrecoverable error, or unrecoverable condition, is defined as one that:
• Is not detected and corrected by the drive itself;
• Is not capable of being detected from the error or fault status provided through the drive or SCSI interface; or
• Is not capable of being recovered by normal drive or system recovery procedures without operator intervention.
5.1.2
Read errors
Before determination or measurement of read error rates:
• The data that is to be used for measurement of read error rates must be verified as being written correctly on
the media.
• All media defect induced errors must be excluded from error rate calculations.
5.1.3
Write errors
Write errors can occur as a result of media defects, environmental interference, or equipment malfunction.
Therefore, write errors are not predictable as a function of the number of bits passed.
If an unrecoverable write error occurs because of an equipment malfunction in the drive, the error is classified
as a failure affecting MTBF. Unrecoverable write errors are those which cannot be corrected within two
attempts at writing the record with a read verify after each attempt (excluding media defects).
5.1.4
Seek errors
A seek error is defined as a failure of the drive to position the heads to the addressed track. There shall be no
more than ten recoverable seek errors in 108 physical seek operations. After detecting an initial seek error, the
drive automatically performs an error recovery process. If the error recovery process fails, a seek positioning
14
Cheetah 18XL Product Manual, Rev. G
error (15h) is reported with a Medium error (3h) or Hardware error (4h) reported in the Sense Key. This is an
unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculations. Refer to
the SCSI Interface Product Manual, part number 75789509, for Request Sense information.
5.2
Reliability and service
You can enhance the reliability of Cheetah 18XL disc drives by ensuring that the drive receives adequate cooling. Section 6.0 provides temperature measurements and other information that may be used to enhance the
service life of the drive. Section 8.3.1 provides recommended air-flow information.
5.2.1
Mean time between failure
The production disc drive shall achieve an MTBF of 1,200,000 hours when operated in an environment that
ensures the case temperatures specified in Section 6.4.1, Table 3 are not exceeded. Short-term excursions up
to the specification limits of the operating environment will not affect MTBF performance. Continual or sustained operation at case temperatures above the values shown in Table 3 may degrade product reliability.
The MTBF target is specified as device power-on hours (POH) for all drives in service per failure.
Estimated power-on operating hours in the period
=
MTBF per measurement period
Number of drive failures in the period
Estimated power-on operation hours means power-up hours per disc drive times the total number of disc drives
in service. Each disc drive shall have accumulated at least nine months of operation. Data shall be calculated
on a rolling average base for a minimum period of six months.
MTBF is based on the following assumptions:
•
•
•
•
8,760 power-on hours per year.
250 average on/off cycles per year.
Operations at nominal voltages.
Systems will provide adequate cooling to ensure the case temperatures specified in Section 6.4.1 are not
exceeded.
Drive failure means any stoppage or substandard performance caused by drive malfunction.
A S.M.A.R.T. predictive failure indicates that the drive is deteriorating to an imminent failure and is considered
an MTBF hit.
5.2.2
Field failure rate vs time
The expected field failure rate is listed below. Drive utilization will vary. An estimated range of utilization is:
•
•
•
•
720 power-on hours (POH) per month.
250 on/off cycles per year.
Read/seek/write operation 20% of power-on hours.
Systems will provide adequate cooling to ensure the case temperatures specified in Section 6.4.1 are not
exceeded.
Month 1
Month 2
Month 3
Month 4
Month 5
Month 6
Month 7
2,500 PPM
1,650 PPM
1,200 PPM
1,000 PPM
890 PPM
840 PPM
805 PPM
Failure rate is calculated as follows:
• No system-induced failures are counted
• Based on 1,200,000 MTBF and 720 power-on hours per month
• Month 1’s rate includes a 300 PPM installation failure
Cheetah 18XL Product Manual, Rev. G
5.2.3
15
Preventive maintenance
No routine scheduled preventive maintenance shall be required.
5.2.4
Service life
The drive shall have a useful service life of five years. Depot repair or replacement of major parts is permitted
during the lifetime (see Section 5.2.5)
5.2.5
Service philosophy
Special equipment is required to repair the drive HDA. In order to achieve the above service life, repairs must
be performed only at a properly equipped and staffed service and repair facility. Troubleshooting and repair of
PCBs in the field is not recommended, because of the extensive diagnostic equipment required for effective
servicing. Also, there are no spare parts available for this drive. Drive warranty is voided if the HDA is opened.
5.2.6
Service tools
No special tools are required for site installation or recommended for site maintenance. Refer to Section 5.2.5.
The depot repair philosophy of the drive precludes the necessity for special tools. Field repair of the drive is not
practical since there are no user purchasable parts in the drive.
5.2.7
Hot plugging Cheetah 18XL disc drives
The ANSI SPI-3 (T10/1302D) document defines the physical requirements for removal and insertion of SCSI
devices on the SCSI bus. Four cases are addressed. The cases are differentiated by the state of the SCSI bus
when the removal or insertion occurs.
Case 1 - All bus devices powered off during removal or insertion
Case 2 - RST signal asserted continuously during removal or insertion
Case 3 - Current I/O processes not allowed during insertion or removal
Case 4 - Current I/O process allowed during insertion or removal, except on the device being changed
Seagate Cheetah 18XL disc drives support all four hot plugging cases. Provision shall be made by the system
such that a device being inserted makes power and ground connections prior to the connection of any device
signal contact to the bus. A device being removed shall maintain power and ground connections after the disconnection of any device signal contact from the bus (see T10/1302D SPI-3 Annex C).
It is the responsibility of the systems integrator to assure that no hazards from temperature, energy, voltage, or
ESD potential are presented during the hot connect/disconnect operation.
All I/O processes for the SCSI device being inserted or removed shall be quiescent. All SCSI devices on the
bus shall have receivers that conform to the SPI-3 standard.
If the device being hot plugged uses single-ended (SE) drivers and the bus is currently operating in low voltage
differential (LVD) mode, then all I/O processes for all devices on the bus must be completed, and the bus quiesced, before attempting to hot plug. Following the insertion of the newly installed device, the SCSI host
adapter must issue a Bus Reset, followed by a synchronous transfer negotiation. Failure to perform the SCSI
Bus Reset could result in erroneous bus operations.
The SCSI bus termination and termination power source shall be external to the device being inserted or
removed.
End users should not mix devices with high voltage differential (HVD) drivers and receivers and devices with
SE, LVD, or multimode drivers and receivers on the same SCSI bus since the common mode voltages in the
HVD environment may not be controlled to safe levels for SE and LVD devices (see ANSI SPI-3).
The disc drive spindle must come to a complete stop prior to completely removing the drive from the cabinet
chassis. Use of the Stop Spindle command or partial withdrawal of the drive, enough to be disconnected from
the power source, prior to removal are methods for insuring that this requirement is met. During drive insertion,
care should be taken to avoid exceeding the limits stated in Section 6.4.4, "Shock and vibration" in this manual.
16
5.2.8
Cheetah 18XL Product Manual, Rev. G
S.M.A.R.T.
S.M.A.R.T. is an acronym for Self-Monitoring Analysis and Reporting Technology. This technology is intended
to recognize conditions that indicate a drive failure and is designed to provide sufficient warning of a failure to
allow data back-up before an actual failure occurs.
Note.
The firmware will monitor specific attributes for degradation over time but cannot predict instantaneous
drive failures.
Each attribute has been selected to monitor a specific set of failure conditions in the operating performance of
the drive, and the thresholds are optimized to minimize “false” and “failed” predictions.
Controlling S.M.A.R.T.
The operating mode of S.M.A.R.T. is controlled by the DEXCPT bit and the PERF bit of the “Informational
Exceptions Control Mode Page” (1Ch). The DEXCPT bit is used to enable or disable the S.M.A.R.T. process.
Setting the DEXCPT bit will disable all S.M.A.R.T. functions. When enabled, S.M.A.R.T. will collect on-line data
as the drive performs normal read/write operations. When the PERF bit is set, the drive is considered to be in
“On-line Mode Only” and will not perform off-line functions.
The process of measuring off-line attributes and saving data can be forced by the RTZ command. Forcing
S.M.A.R.T. will reset the timer so that the next scheduled interrupt will be two hours.
The drive can be interrogated by the host to determine the time remaining before the next scheduled measurement and data logging process will occur. This is accomplished by a log sense command to log page 0x3E.
The purpose is to allow the customer to control when S.M.A.R.T. interruptions occur. As described above, forcing S.M.A.R.T by the Rezero Unit command will reset the timer.
Performance impact
S.M.A.R.T. attribute data will be saved to the disc for the purpose of recreating the events that caused a predictive failure. The drive will measure and save parameters once every two hours subject to an idle period on the
SCSI bus. The process of measuring off-line attribute data and saving data to the disc is uninterruptable and
the maximum delay is summarized below:
Maximum processing delay
S.M.A.R.T. delay times
On-line only delay
DEXCPT = 0, PERF = 1
ST318404: 93 ms
Fully enabled delay
DEXCPT = 0, PERF = 0
ST318404: 164 ms
ST39204: 57 ms
ST39204: 150 ms
Reporting control
Reporting is controlled in the Informational Exceptions Control Page (1Ch). Subject to the reporting method,
the firmware will issue a 01-5D00 sense code to the host. The error code is preserved through bus resets and
power cycles.
Determining rate
S.M.A.R.T. monitors the rate at which errors occur and signals a predictive failure if the rate of degraded error
rate increases to an unacceptable level. To determine rate, error events are logged and compared to the number of total operations for a given attribute. The interval defines the number of operations over which to measure the rate. The counter that keeps track of the current number of operations is referred to as the Interval
Counter.
S.M.A.R.T. measures error rate, hence for each attribute the occurrence of an error is recorded. A counter
keeps track of the number of errors for the current interval. This counter is referred to as the Failure Counter.
Error rate is simply the number of errors per operation. The algorithm that S.M.A.R.T. uses to record rates of
error is to set thresholds for the number of errors and the interval. If the number of errors exceeds the threshold
before the interval expires, then the error rate is considered to be unacceptable. If the number of errors does
Cheetah 18XL Product Manual, Rev. G
17
not exceed the threshold before the interval expires, then the error rate is considered to be acceptable. In either
case, the interval and failure counters are reset and the process starts over.
Predictive failures
S.M.A.R.T. signals predictive failures when the drive is performing unacceptably for a period of time. The firmware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accomplish this, a counter is incremented whenever the error rate is unacceptable and decremented (not to exceed
zero) whenever the error rate is acceptable. Should the counter continually be incremented such that it reaches
the predictive threshold, a predictive failure is signaled. This counter is referred to as the Failure History
Counter. There is a separate Failure History Counter for each attribute.
5.2.9
Drive Self Test (DST)
Drive Self Test (DST) is a technology designed to recognize drive fault conditions that qualify the drive as a
failed unit. DST validates the functionality of the drive at a system level.
There are two test coverage options implemented in DST:
1. Extended test
2. Short text
The most thorough option is the extended test that performs various tests on the drive and scans every logical
block address (LBA) of the drive. The short test is time-restricted and limited in length—it does not scan the
entire media surface, but does some fundamental tests and scans portions of the media.
If DST encounters an error during either of these tests, it reports a fault condition. If the drive fails the test,
remove it from service and return it to Seagate for service.
5.2.9.1
DST Failure Definition
The drive will present a “diagnostic failed” condition through the self-tests results value of the diagnostic log
page if a functional failure is encountered during DST. The channel and servo parameters are not modified to
test the drive more stringently, and the number of retries are not reduced. All retries and recovery processes
are enabled during the test. If data is recoverable, no failure condition will be reported regardless of the number
of retries required to recover the data.
The following conditions are considered DST failure conditions:
•
•
•
•
Seek error after retries are exhausted
Track-follow error after retries are exhausted
Read error after retries are exhausted
Write error after retries are exhausted.
Recovered errors will not be reported as diagnostic failures.
5.2.9.2
Implementation
This section provides all of the information necessary to implement the DST function on this drive.
5.2.9.2.1
State of the drive prior to testing
The drive must be in a ready state before issuing the Send Diagnostic command. There are multiple reasons
why a drive may not be ready, some of which are valid conditions, and not errors. For example, a drive may be
in process of doing a format, or another DST. It is the responsibility of the host application to determine the “not
ready” cause.
While not technically part of DST, a Not Ready condition also qualifies the drive to be returned to Seagate as a
failed drive.
A Drive Not Ready condition is reported by the drive under the following conditions:
• Motor will not spin
• Motor will not lock to speed
18
Cheetah 18XL Product Manual, Rev. G
• Servo will not lock on track
• Drive cannot read configuration tables from the disc
In these conditions, the drive responds to a Test Unit Ready command with an 02/04/00 or 02/04/03 code.
5.2.9.2.2
Invoking DST
To invoke DST, submit the Send Diagnostic command with the appropriate Function Code (001b for the short
test or 010b for the extended test) in bytes 1, bits 5, 6, and 7. Refer to the SCSI Interface Product Manual, part
number 75789509, for additional information about invoking DST.
5.2.9.2.3
Short and extended tests
DST has two testing options:
1. short
2. extended
These testing options are described in the following two subsections.
Each test consists of three segments: an electrical test segment, a servo test segment, and a read/verify scan
segment.
Short test (Function Code: 001b)
The purpose of the short test is to provide a time-limited test that tests as much of the drive as possible within
120 seconds. The short test does not scan the entire media surface, but does some fundamental tests and
scans portions of the media. A complete read/verify scan is not performed and only factual failures will report a
fault condition. This option provides a quick confidence test of the drive.
Extended test (Function Code: 010b)
The objective of the extended test option is to empirically test critical drive components. For example, the seek
tests and on-track operations test the positioning mechanism. The read operation tests the read head element
and the media surface. The write element is tested through read/write/read operations. The integrity of the
media is checked through a read/verify scan of the media. Motor functionality is tested by default as a part of
these tests.
The anticipated length of the Extended test is reported through the Control Mode page.
5.2.9.2.4
Log page entries
When the drive begins DST, it creates a new entry in the Self-test Results Log page. The new entry is created
by inserting a new self-test parameter block at the beginning of the self-test results log parameter section of the
log page. Existing data will be moved to make room for the new parameter block. The drive reports 20 parameter blocks in the log page. If there are more than 20 parameter blocks, the least recent parameter block will be
deleted. The new parameter block will be initialized as follows:
1. The Function Code field is set to the same value as sent in the DST command
2. The Self-Test Results Value field is set to Fh
3. The drive will store the log page to non-volatile memory
After a self-test is complete or has been aborted, the drive updates the Self-Test Results Value field in its SelfTest Results Log page in non-volatile memory. The host may use Log Sense to read the results from up to the
last 20 self-tests performed by the drive. The self-test results value is a 4-bit field that reports the results of the
test. If the field is zero, the drive passed with no errors detected by the DST. If the field is not zero, the test
failed for the reason reported in the field.
The drive will report the failure condition and LBA (if applicable) in the Self-test Results Log parameter. The
Sense key, ASC, ASCQ, and FRU are used to report the failure condition.
Cheetah 18XL Product Manual, Rev. G
5.2.9.2.5
19
Abort
There are several ways to abort a diagnostic. You can use a SCSI Bus Reset or a Bus Device Reset message
to abort the diagnostic.
You can abort a DST executing in background mode by using the abort code in the DST Function Code field.
This will cause a 01 (self-test aborted by the application client) code to appear in the self-test results values
log. All other abort mechanisms will be reported as a 02 (self-test routine was interrupted by a reset condition).
5.2.10
Product warranty
Beginning on the date of shipment to customer and continuing for a period of five years, Seagate warrants that
each product (including components and subassemblies) or spare part that fails to function properly under normal use due to defect in materials on workmanship or due to nonconformance to the applicable specifications
will be repaired or replaced, at Seagate’s option and at no charge to customer, if returned by customer at customer’s expense to Seagate’s designated facility in accordance with Seagate’s warranty procedure. Seagate
will pay for transporting the repair or replacement item to customer. For more detailed warranty information
refer to the Standard terms and conditions of Purchase for Seagate products.
Shipping
When transporting or shipping a drive, a Seagate approved container must be used. Keep your original box.
They are easily identified by the Seagate-approved package label. Shipping a drive in a non-approved container voids the drive warranty.
Seagate repair centers may refuse receipt of components improperly packaged or obviously damaged in transit. Contact your Authorized Seagate Distributor to purchase additional boxes. Seagate recommends shipping
by an air-ride carrier experienced in handling computer equipment.
Product repair and return information
Seagate customer service centers are the only facilities authorized to service Seagate drives. Seagate does
not sanction any third-party repair facilities. Any unauthorized repair or tampering with the factory-seal voids
the warranty.
20
Cheetah 18XL Product Manual, Rev. G
Cheetah 18XL Product Manual, Rev. G
6.0
21
Physical/electrical specifications
This section provides information relating to the physical and electrical characteristics of the Cheetah 18XL
drive.
6.1
AC power requirements
None.
6.2
DC power requirements
The voltage and current requirements for a single drive are shown in the following table. Values indicated apply
at the drive power connector. The table shows current values in Amperes.
Table 2:
DC power requirements
ST318404
ST39204
Notes
SE mode
Voltage
LVD mode
+5 V
+12 V
SE mode
+5 V
+12 V
LVD mode
+5 V
+12 V
+5 V
+12 V
±5%
±5%[2] ±5%
±5%[2] ±5%
±5%[2] ±5%
±5%[2]
Regulation
[5]
Average idle current DCX
[1][7] 0.70
0.40
0.70
0.40
0.55
0.35
0.55
0.35
Maximum starting current
(peak DC) DC
(peak AC) AC
[3]
[3]
1.7
2.4
0.7
1.7
2.4
0.7
1.7
2.3
0.7
1.7
2.3
Delayed motor start (max) DC
[1][4] 0.6
0.03
0.6
0.03
0.6
0.03
0.6
0.03
Peak operating current
DCX
Maximum DC
Maximum (peak) DC
[1][6] 0.96
[1]
1.0
1.5
0.93
0.97
2.3
0.96
1.0
1.5
0.93
0.97
2.3
0.80
0.80
1.2
0.75
0.80
2.0
0.80
0.80
1.2
0.75
0.80
2.0
[1]
[2]
[3]
[4]
[5]
[6]
[7]
0.7
Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks
will exceed these values. Power supply at nominal voltage. N = 2, 22 Degrees C ambient.
For +12 V, a –10% tolerance is permissible during initial start of spindle, and must return to ±5% before
10,017 rpm is reached. The ±5% must be maintained after the drive signifies that its power-up sequence
has been completed and that the drive is able to accept selection by the host initiator.
See +12 V current profile in Figure 3.
This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start
Motor command.
See Section 6.2.1 “Conducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,
and transient response.
Operating condition is defined as random 8 block reads at 204 I/Os per second. Current and power specified at nominal voltages. Decreasing +5 volts by +5% increases +5 volt current by 3.58%.
During idle, the drive heads are relocated every 60 seconds to a random location within the band from
track zero to one-fourth of maximum track.
General Notes from Table 2:
1. Minimum current loading for each supply voltage is not less than 1.2% of the maximum operating current
shown.
2. The +5 and +12 volt supplies shall employ separate ground returns.
3. Where power is provided to multiple drives from a common supply, careful consideration for individual drive
power requirements should be noted. Where multiple units are powered on simultaneously, the peak starting current must be available to each device.
4. Parameters, other than spindle start, are measured after a 10-minute warm up.
5. No terminator power.
22
Cheetah 18XL Product Manual, Rev. G
6.2.1
Conducted noise immunity
Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz.
Maximum allowed noise values given below are peak to peak measurements and apply at the drive power connector.
+5 V =
+12 V =
150 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz.
150 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz.
6.2.2
Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down. Daisy-chain operation requires that power be maintained on the SCSI bus terminator to ensure
proper termination of the peripheral I/O cables. To automatically delay motor start based on the target ID (SCSI
ID) enable the Delay Motor Start option and disable the Enable Motor Start option on the J2 connector. See
Section 8.1 for pin selection information. To delay the motor until the drive receives a Start Unit command,
enable the Enable Remote Motor Start option on the J2 connector.
6.2.3
12 V - Current profile
Figure 3 identifies the drive +12 V current profile. The current during the various times is as shown:
T0 T1 T2 T3 T4 T5 -
Power is applied to the drive.
Controller self tests are performed.
Spindle begins to accelerate under current limiting after performing drive internal
diagnostics. See Note 1 of Table 2.
The spindle is up to speed and the head-arm restraint is unlocked.
The adaptive servo calibration sequence is performed.
Calibration is complete and drive is ready for reading and writing.
Note.
All times and currents are typical. See Table 2 for maximum current requirements.
Cheetah 18XL Product Manual, Rev. G
23
+12 Volt Current during spindle start – Typical Amperes
3.0
2.5
AC Envelope
2.0
Nominal (average)
DC curve
A
1.5
1.0
0.5
0.0
T2
T
T1
0.0
2
T4
T3
4
6
T5
8
10
12
14
16
18
16
18
20
Seconds
Figure 3.
Typical ST318404 drive +12 V current profile
+12 Volt Current during spindle start – Typical Amperes
3.0
2.5
AC Envelope
2.0
Nominal (average)
DC curve
A
1.5
1.0
0.5
0.0
0.0
2
4
6
8
10
Seconds
Figure 4.
Typical ST39204 drive +12 V current profile
12
14
20
24
Cheetah 18XL Product Manual, Rev. G
+5 Volt Current during spindle start – Typical Amperes
1.2
1.0
0.8
0.6
A
Nominal (average) DC curve
0.4
0.2
0.0
0.0
2
4
6
8
10
12
14
16
18
20
16
18
20
Seconds
Figure 5.
Typical ST318404 drive +5 V current profile
+5 Volt Current during spindle start – Typical Amperes
1.2
1.0
0.8
0.6
Nominal (average) DC curve
A
0.4
0.2
0.0
0.0
2
4
6
8
10
Seconds
Figure 6.
TypicalST39204 drive +5 V current profile
12
14
Cheetah 18XL Product Manual, Rev. G
6.3
25
Power dissipation
ST318404
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 8.5 watts
(29.0 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 8.5
watts (29.0 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 7 and 8). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour,
multiply watts by 3.4123.
1.2
5V A
12V A
1.0
Amperes
0.8
0.6
0.4
0.2
0.0
0
50
100
150
I/Os per Second
Figure 7.
ST318404 DC current and power vs. input/output operations per second (SE)
1.2
5V A
12V A
1.0
Amperes
0.8
0.6
0.4
0.2
0.0
0
50
100
150
I/Os per Second
Figure 8.
ST318404 DC current and power vs. input/output operations per second (LVD)
26
Cheetah 18XL Product Manual, Rev. G
ST39204
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 7.0 watts
(23.8 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 7.0
watts (23.8 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 9 and 10). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour,
multiply watts by 3.4123.
1.2
5V A
12V A
1.0
Amperes
0.8
0.6
0.4
0.2
0.0
0
50
100
150
I/Os per Second
Figure 9.
ST39204 DC current and power vs. input/output operations per second (SE)
1.2
5V A
12V A
1.0
Amperes
0.8
0.6
0.4
0.2
0.0
0
50
100
150
I/Os per Second
Figure 10.
ST39204 DC current and power vs. input/output operations per second (LVD)
Cheetah 18XL Product Manual, Rev. G
6.4
27
Environmental limits
Temperature and humidity values experienced by the drive must be such that condensation does not occur on
any drive part. Altitude and atmospheric pressure specifications are referenced to a standard day at 58.7°F
(14.8°C). Maximum wet bulb temperature is 82°F (28°C).
6.4.1
Temperature
a. Operating
With cooling designed to maintain the case temperatures of Table 3, Column 2, the drive meets all specifications over a 41°F to 131°F (5°C to 55°C) drive ambient temperature range with a maximum temperature
gradient of 36°F (20°C) per hour. The enclosure for the drive should be designed such that the temperatures at the locations specified in Table 3, column 1 are not exceeded. Air flow may be needed to achieve
these temperature values (see Section 8.3 and 8.3.1). Operation at case temperatures above these values
may adversely affect the drives ability to meet specifications.
The MTBF specification for the drive is based on operating in an environment that ensures that the case
temperatures specified in Table 3, column 2 are not exceeded. Occasional excursions to drive ambient temperatures of 131°F (55°C) or 41°F (5°C) may occur without impact to specified MTBF. Air flow may be
needed to achieve these temperatures (see Section 8.3.1). Continual or sustained operation at case temperatures above these values may degrade MTBF.
To confirm that the required cooling for the electronics and HDA is provided, place the drive in its final
mechanical configuration, perform random write/read operations. After the temperatures stabilize, measure
the case temperature of the components listed in Table 3 (see note [3]).
The maximum allowable HDA case temperature is 65°C. Operation of the drive at the maximum case temperature is intended for short time periods only. Continuous operation at the elevated temperatures will
reduce product reliability.
Table 3:
PCBA and HDA temperatures
Items in
Figure 11
Column 1
Maximum case [4]
temperature ( °C)
operating (55 ° ambient)[3]
Column 2
Maximum allowable
case [4] temperatures (°C)
to meet MTBF spec.[3]
HDA [3]
U2
U5
U11
U8
65
123
123
105
105
50
103
103
85
85
Notes.
[1]
[2]
[3]
[4]
Section 8.3.1 describes the air-flow patterns to be used to meet case temperatures in column 2. Air
flow was opposite that shown in Section 8.3.1. Air velocity should be adequate to ensure that the case
temperatures in column 2 are not exceeded during drive operation.
The temperatures in columns 1 and 2 are calculated and may not reflect actual operating values. Sufficient cooling is required to ensure that these values are not exceeded.
Measure HDA temp at point labeled “HDA” on Figure 11.
PCB mounted integrated circuit case.
28
Cheetah 18XL Product Manual, Rev. G
b. Non-operating
–40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This
specification assumes that the drive is packaged in the shipping container designed by Seagate for use with
drive.
HDA Temp.
Check Point
.5
"
Model “LC” PCBA [1]
Model “LW” PCBA [1]
J6
U11
U11
U15
U15
U6
U6
U2
U8
U8
U16
U16
U4
U18
J3
U19
U3
J2
U3
J2
J3
U24
U2
U4
U18
U19
L8
U5
U24
L7
U5
L8
L7
J1
PCBA 1
Figure 11.
Locations of PCBA components listed in Table 3
6.4.2
Relative humidity
J1
PCBA 2
The values below assume that no condensation on the drive occurs.
a. Operating
5% to 95% non-condensing relative humidity with a maximum gradient of 10% per hour.
b. Non-operating
5% to 95% non-condensing relative humidity.
6.4.3
Effective altitude (sea level)
a. Operating
–1,000 to +10,000 feet (–305 to +3,048 meters)
b. Non-operating
–1,000 to +40,000 feet (–305 to +12,200 meters)
Cheetah 18XL Product Manual, Rev. G
6.4.4
29
Shock and vibration
Shock and vibration limits specified in this document are measured directly on the drive chassis. If the drive is
installed in an enclosure to which the stated shock and/or vibration criteria is applied, resonances may occur
internally to the enclosure resulting in drive movement in excess of the stated limits. If this situation is apparent,
it may be necessary to modify the enclosure to minimize drive movement.
The limits of shock and vibration defined within this document are specified with the drive mounted by any of
the four methods shown in Figure 12, and in accordance with the restrictions of Section 8.4. Orientation of the
side nearest the LED may be up or down.
6.4.4.1
Shock
a. Operating—normal
The drive, as installed for normal operation, shall operate error free while subjected to intermittent shock not
exceeding 15.0 Gs at a maximum duration of 11 msec (half sinewave). Shock may be applied in the X, Y, or
Z axis.
b. Operating—abnormal
Equipment, as installed for normal operation, does not incur physical damage while subjected to intermittent shock not exceeding 15 Gs at a maximum duration of 11 msec (half sinewave). Shock occurring at
abnormal levels may promote degraded operational performance during the abnormal shock period. Specified operational performance will continue when normal operating shock levels resume. Shock may be
applied in the X, Y, or Z axis. Shock is not to be repeated more than two times per second.
c. Non-operating
The limits of non-operating shock shall apply to all conditions of handling and transportation. This includes
both isolated drives and integrated drives.
The drive subjected to nonrepetitive shock not exceeding 150 Gs at a maximum duration of 11 msec (half
sinewave) shall not exhibit device damage or performance degradation. Shock may be applied in the X, Y,
or Z axis.
The drive subjected to nonrepetitive shock not exceeding 250 Gs at a maximum duration of 2 msec (half
sinewave) does not exhibit device damage or performance degradation. Shock may be applied in the X, Y,
or Z axis.
d. Packaged
Disc drives shipped as loose load (not palletized) general freight will be packaged to withstand drops from
heights as defined in the table below. For additional details refer to Seagate specifications 30190-001
(under 100 lbs/45 kg) or 30191-001 (over 100 lbs/45 Kg).
Package size
Packaged/product weight
Drop height
<600 cu in (<9,800 cu cm)
600-1800 cu in (9,800-19,700 cu cm)
>1800 cu in (>19,700 cu cm)
>600 cu in (>9,800 cu cm)
Any
0-20 lb (0 to 9.1 kg)
0-20 lb (0 to 9.1 kg)
20-40 lb (9.1 to 18.1 kg)
60 in (1524 mm)
48 in (1219 mm)
42 in (1067 mm)
36 in (914 mm)
Drives packaged in single or multipacks with a gross weight of 20 pounds (8.95 kg) or less by Seagate for
general freight shipment shall withstand a drop test from 48 inches (1,070 mm) against a concrete floor or
equivalent.
30
Cheetah 18XL Product Manual, Rev. G
Z
X
Y
X
Figure 12.
Recommended mounting
Z
Y
Cheetah 18XL Product Manual, Rev. G
6.4.4.2
31
Vibration
a. Operating - Normal
The drive as installed for normal operation, shall comply with the complete specified performance while
subjected to continuous vibration not exceeding
5-22Hz @ 0.045 inches (1.143 mm) displacement (peak to peak)
22-300 Hz @ 1.1 G (zero to peak)
300-350 Hz @ 0.83 G (zero to peak)
Vibration may be applied in the X, Y, or Z axis.
b. Operating - Abnormal
Equipment as installed for normal operation shall not incur physical damage while subjected to periodic
vibration not exceeding:
5-22 Hz @ 0.061 inches (1.5494 mm) displacement (peak to peak)
22-300 Hz @ 1.5 G (zero to peak)
300-350 Hz @ 1.125 G (zero to peak)
Vibration may be applied in the X, Y, or Z axis.
Vibration occurring at these levels may degrade operational performance during the abnormal vibration
period. Specified operational performance will continue when normal operating vibration levels are
resumed. This assumes system recovery routines are available.
c. Non-operating
The limits of non-operating vibration shall apply to all conditions of handling and transportation. This
includes both isolated drives and integrated drives.
The drive shall not incur physical damage or degraded performance as a result of continuous vibration not
exceeding
5-22 Hz @ 0.10 inches (2.54 mm) displacement (peak to peak)
22-400 Hz @ 2.5 G (zero to peak)
Vibration may be applied in the X, Y, or Z axis.
6.4.5
Air cleanliness
The drive is designed to operate in a typical office environment with minimal environmental control.
6.4.6
Acoustics
Sound power during idle mode shall be 3.8 bels typical when measured to ISO 7779 specification.
There will not be any discrete tones more than 10 dB above the masking noise on typical drives when measured according to Seagate specification 30553-001. There will not be any tones more than 24 dB above the
masking noise on any drive.
6.4.7
Electromagnetic susceptibility
See Section 2.1.2.
32
6.5
Cheetah 18XL Product Manual, Rev. G
Mechanical specifications
The following nominal dimensions are exclusive of the decorative front panel accessory. However, dimensions
of the front panel are shown in figure below. Refer to Figures 13 and 14 for detailed mounting configuration
dimensions. See Section 8.4, “Drive mounting.”
Height:
Width:
Depth:
Weight:
1.029 in
4.015 in
5.775 in
1.5 pounds (ST318404)
26.1366 mm
101.981 mm
146.685 mm
0.680 kilograms
K
S
// T -Z-
[1]
-Z-
L
J
H
B
Notes:
A
R
-Z-
M
C
[1] Mounting holes are 6-32 UNC 2B, three
on each side and four on the bottom.
Max screw penetration into side of drive
is 0.15 in. (3.81 mm). Max screw
tightening torque is 6.0 in-lb (3.32 nm)
with minimum full thread engagement of
0.12 in. (3.05 mm).
U -XA
B
C
D
E
F
G
H
J
K
L
M
P
R
S
T
U
P
G
F
[1]
E
D
-X-
Figure 13.
ST318404LW mounting configuration dimensions
Dimension Table
Inches
Millimeters
26.10 max
1.028 max
147.00 max
5.787 max
101.60 ± .25
4.000 ± .010
92.25 ± .25
3.750 ± .010
3.18 ± .25
.125 ± .010
44.45 ± .25
1.750 ± .010
41.28 ± .50
1.625 ± .020
28.50 ± .50
1.122 ± .020
101.60 ± .25
4.000 ± .010
6.35 ± .25
.250 ± .010
41.60 ± .25
1.638 ± .010
4.60 ± .50
.181 ± .020
41.28 ± .50
1.625 ± .020
6.73 ± .25
.265 ± .010
7.00 ± 1.02
.315 ± .040
0.38 max
.015 max
0.38 max
.015 max
Cheetah 18XL Product Manual, Rev. G
33
K
S
// T -Z-
[1]
-Z-
L
J
H
B
Notes:
R
N -Z- -X-
A
-Z-
M
[1] Mounting holes are 6-32 UNC 2B, three
on each side and four on the bottom.
Max screw penetration into side of drive
is 0.15 in. (3.81 mm). Max screw
tightening torque is 6.0 in-lb (3.32 nm)
with minimum full thread engagement of
0.12 in. (3.05 mm).
C
U -XA
B
C
D
E
F
H
J
K
L
M
N
P
R
S
T
U
P
F
[1]
E
D
-X-
Figure 14.
ST318404LC mounting configuration dimensions
Dimension Table
Inches
Millimeters
26.10 max
1.028 max
147.00 max
5.787 max
101.60 ± .25
4.000 ± .010
92.25 ± .25
3.750 ± .010
3.18 ± .25
.125 ± .010
44.45 ± .25
1.750 ± .010
28.50 ± .50
1.122 ± .020
101.60 ± .25
4.000 ± .010
6.35 ± .25
.250 ± .010
41.60 ± .25
1.638 ± .010
4.60 ± .50
.181 ± .020
1.20 max
.040 max
41.28 ± .50
1.625 ± .020
66.50 ± .25
2.618 ± .010
7.00 ± 1.02
.276 ± .040
0.38 max
.015 max
0.38 max
.015 max
34
Cheetah 18XL Product Manual, Rev. G
Cheetah 18XL Product Manual, Rev. G
7.0
35
Defect and error management
The drive, as delivered, complies with this specification. The read error rate and specified storage capacity are
not dependent upon use of defect management routines by the host (initiator).
Defect and error management in the SCSI system involves the drive internal defect/error management and
SCSI systems error considerations (errors in communications between Initiator and the drive). Tools for use in
designing a defect/error management plan are briefly outlined in this section, with references to other sections
where further details are given.
7.1
Drive internal defects
During the initial drive format operation at the factory, media defects are identified, tagged as being unusable,
and their locations recorded on the drive primary defects list (referred to as the “P” list and also as the ETF
defect list). At factory format time, these known defects are also reallocated, that is, reassigned to a new place
on the medium and the location listed in the defects reallocation table. The “P” list is not altered after factory
formatting. Locations of defects found and reallocated during error recovery procedures after drive shipment
are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator using the
Read Defect Data command (see the SCSI Interface Product Manual, part number 75789509).
7.2
Drive error recovery procedures
Whenever an error occurs during drive operation, the drive, if programmed to do so, performs error recovery
procedures to attempt to recover the data. The error recovery procedures used depend on the options previously set up in the error recovery parameters mode page. Error recovery and defect management may involve
the use of several SCSI commands, the details of which are described in the SCSI Interface Product Manual.
The drive implements selectable error recovery time limits such as are required in video applications. For additional information on this, refer to the Error Recovery Page table in the SCSI Interface Product Manual, which
describes the Mode Select/Mode Sense Error Recovery parameters.
The error recovery scheme supported by the drive provides a means to control the total error recovery time for
the entire command in addition to controlling the recovery level for a single LBA. The total amount of time spent
in error recovery for a command can be limited via the Recovery Time Limit bytes in the Error Recovery Mode
Page. The total amount of time spent in error recovery for a single LBA can be limited via the Read Retry Count
or Write Retry Count bytes in the Error Recovery Mode Page.
The drive firmware error recovery algorithms consist of 11 levels for read recoveries and 15 levels for writes.
Table 4 equates the Read and Write Retry Count with the maximum possible recovery time for read and write
recovery of individual LBAs. The times given do not include time taken to perform reallocations, if reallocations
are performed. Reallocations are performed when the ARRE bit (for reads) or AWRE bit (for writes) is one, the
RC bit is zero, and the Recovery Time Limit for the command has not yet been met. Time needed to perform
reallocation is not counted against the Recovery Time Limit.
The Read Continuous (RC) bit, when set to one, requests the disc drive to transfer the requested data length
without adding delays (for retries or ECC correction) that may be required to insure data integrity. The disc
drive may send erroneous data in order to maintain the continuous flow of data. The RC bit should only be
used when data integrity is not a concern and speed is of utmost importance. If the Recovery Time Limit or
retry count is reached during error recovery, the state of the RC bit is examined. If the RC bit is set, the drive
will transfer the unrecovered data with no error indication and continue to execute the remaining command. If
the RC bit is not set, the drive will stop data transfer with the last good LBA, and report a “Check Condition,
Unrecovered Read Error.”
36
Cheetah 18XL Product Manual, Rev. G
Table 4:
Read and write retry count maximum recovery times [1]
Read retry
count [1]
Maximum recovery time per
LBA (cumulative, msec)
Write retry
count
Maximum recovery time per
LBA (cumulative, msec)
0
77.61
0
65.67
1
89.55
1
83.58
2
304.47
2
89.55
3
328.35
3
107.46
4
400.14
4
214.92
5
447.9
5
256.71
6
513.57
6
435.81
7
645.17
7
453.72
8
669.05
8
483.57
9
722.78
9
501.48
10
2182.78
10
1537.3
11 (default)
2991.88
11
1555.21
12
1561.18
13
1579.09
14
1686.55
15 (default)
1728.34
[1]
These values are subject to change.
Setting these retry counts to a value below the default setting could result in an increased unrecovered
error rate which may exceed the value given in this product manual. A setting of zero (0) will result in the
drive not performing error recovery.
For example, suppose the Read/Write Recovery page has the RC bit set to 0, read retry count set to 4,
and the recovery time limit field (Mode Sense page 01, bytes 10 and 11) set to FF FF hex (maximum). A
four LBA Read command is allowed to take up to 400.14 msec recovery time for each of the four LBAs in
the command. If the recovery time limit is set to 00 C8 hex (200 msec decimal) a four LBA read command
is allowed to take up to 200 msec for all error recovery within that command. The use of the Recovery
Time Limit field allows finer granularity on control of the time spent in error recovery. The recovery time
limit only starts counting when the drive is executing error recovery and it restarts on each command.
Therefore, each command’s total recovery time is subject to the recovery time limit. Note: A recovery time
limit of 0 will use the drive’s default value of FF FF. Minimum recovery time limit is achieved by setting the
Recovery Time Limit field to 00 01.
7.3
SCSI systems errors
Information on the reporting of operational errors or faults across the interface is given in the SCSI Interface
Product Manual, part number 75789509. Message Protocol System is described in the SCSI Interface Product
Manual. Several of the messages are used in the SCSI systems error management system. The Request
Sense command returns information to the host about numerous kinds of errors or faults. The Receive Diagnostic Results reports the results of diagnostic operations performed by the drive.
Status returned by the drive to the Initiator is described in the SCSI Interface Product Manual. Status reporting
plays a role in the SCSI systems error management and its use in that respect is described in sections where
the various commands are discussed.
Cheetah 18XL Product Manual, Rev. G
8.0
Note.
37
Installation
These drives are designed to be used only on single-ended (SE) or low voltage differential (LVD) busses. Do not install these drives on a high voltage differential (HVD) bus.
The first thing to do when installing a drive is to set the drive SCSI ID and set up certain operating options. This
is usually done by installing small shorting jumpers on the pins of connectors J2 and J6 on the PCBA (or J1Auxiliary on the LW model), or via the drive to host I/O signals on the LC model. Some users connect cables to
J6 or J5-Auxiliary and perform the set-up using remote switches.
Configure drive options
For option jumper locations and definitions refer to Figures 15, 16, and 17. Drive default mode parameters are
not normally needed for installation. Refer to Section 9.3.2 for default mode parameters if they are needed.
• Ensure that the SCSI ID of the drive is not the same as the host adapter. Most host adapters use SCSI ID 7
because ID 7 is the highest priority on both 8 and 16 bit data buses.
• If multiple devices are on the bus set the drive SCSI ID to one that is not presently used by other devices on
the bus.
• If the drive is the only device on the bus, attach it to the end of the SCSI bus cable. The user, system integrator, or host equipment manufacturer must provide external terminators.
Note.
For additional information about terminator requirements, refer to Sections 9.8 and 9.9.
• Set all appropriate option jumpers for desired operation prior to power on. If jumpers are changed after
power has been applied, recycle the drive power to make the new settings effective.
• Installation instructions are provided by host system documentation or with any additionally purchased drive
installation software. If necessary see Section 10 for Seagate support services telephone numbers.
• Do not remove the manufacturer’s installed labels from the drive and do not cover with additional labels, as
the manufacturer labels contain information required when servicing the product.
Formatting
• It is not necessary to low level format this drive. The drive is shipped from the factory low level formatted in
512 byte sectors.
• Reformat the drive if a different spare sector allocation scheme is selected.
• High level formatting the drive involves assigning one or more partitions or logical drives to the drive volume.
Follow the instructions in the system manuals for the system into which the drive is to be installed.
8.1
Drive ID/option select header
Figures 15 and 16 show views of the drive ID select jumper connectors. Figure 17 shows the option select
jumper connector for all models. Figure 15 shows the drive’s J5-Auxiliary jumper connector. Both J5-Auxiliary
and J6 have pins for selecting drive ID and for connecting the remote LED cable. Only one or the other should
be used, although using both at the same time would not damage the drive. The notes following the figures
describe the functions of the various jumper positions on the connectors J2, J5-Auxiliary and J6. See your local
sales representative for suggested part number. A bag with the two jumper plug types is shipped with the standard OEM drives.
38
Cheetah 18XL Product Manual, Rev. G
Drive
Front
Jumper Plug
(enlarged to
show detail)
Pin 1
J6 [1] [5]
Reserved
L R
E E
D S
A3 A2 A1A0
SCSI ID = 0
(default)
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
[2]
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
[5]
[4] Host
Alternate
Usage Plug:
Reserved
Pins
11 9 7 5 3 1
8
Shipped with cover installed.
Do not install jumpers;
retain cover.
6 4 2
+5V
[6]
Ground
Drive Activity LED
[4] Dashed area is optional host circuitry (external to the drive)
connected to host supplied optional usage plug.
[5] Do not connect anything to pins 13-20.
Figure 15.
J6 jumper header
Cheetah 18XL Product Manual, Rev. G
39
Drive HDA (rear view, PCB facing downward)
Pin 1
J5
Pin 1
+5V Ground
[1] [2]
4P
[2]
68 Pin
SCSI I/O Connector
J1
SCSI ID = 0
3P 2P
1P
J1-DC Power
(default)
PCB
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
For ID selection use
jumpers as shown or
connect a cable for
remote switching as
shown below.
SCSI ID = 7
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
Reserved
Host [4]
Alternate
Usage Plug
A 3 A 2 A 1A 0
Pins 1, 3, 5, and 7 are
optional connections to
switching circuits in host
equipment to establish
drive ID.
[5]
11 9 7 5 3 1
A0 A1 A2 A3
+5V
12 10 8 6 4 2
+5V
[5]
Ground
[6]
Drive Activity LED
[4] Dashed area is optional host circuitry (external to the
drive) connected to host supplied optional usage plug.
Figure 16.
J5 jumper header (on LW models only)
Remote Switches
Pins 2, 4, 6, and 8 are
normally not grounded.
They are driven low (ground)
for 250 ms after a Reset
or PWR ON to allow drive to
read SCSI ID selected.
40
Cheetah 18XL Product Manual, Rev. G
J2
Jumper
Positions
Pin 1
RR
S D MW P E E T
E S EP DSS P
Force single-ended bus mode
Delay Motor Start
[2]
Enable Remote Motor Start
Write Protect
Parity Disable
*Additional notes on these
functions in section 8.1.2.
Reserved
J2
Jumper Plug
(enlarged to
show detail)
Figure 17.
J2 option select header
8.1.1
Notes for figures 15, 16, and 17.
[1]
(applies to “LW” model only;
reserved on “LC” model)
Term. Power to SCSI Bus
J2
J6
Drive
Front
Notes explaining the functions of the various jumpers on jumper header connectors J2, J5, and J6 are
given here and in Section 8.1.2. The term “default” means as standard OEM units are configured with a
jumper on those positions when shipped from factory. “Off” means no jumper is installed; “On” means a
jumper is installed. OFF or ON underlined is factory default condition.
The PCBA on LC models does not have connector J5. The J5 connector signals conform to SFF-8009
Revision 2.0, Unitized Connector for Cabled Drives, signal assignments for auxiliary connectors.
[2]
These signals are also on 80-pin J1 I/O connector. See tables 15 and 16, note 9.
[3]
Voltage supplied by the drive.
[4]
Dashed area is optional host circuitry (external to the drive) connected to host supplied optional usage
plug.
[5]
Do not connect anything to J5 pins 9 and 12 or J6 pins 13 - 20.
[6]
Connect an external Drive Activity LED to J6 pins 11 and 12 (see Figure 15), or to J5 pin 8 (see Figure 16)
and the drives +5V power source, through an appropriately sized current limiting resistor. The drive
provides an internal 150 ohm current limiting resistor for the J6 connection.
Cheetah 18XL Product Manual, Rev. G
8.1.2
Function description
J2
jumper
installation
SE
On
Off
ME
Off
On
Off
On
On
PD
On
Off
RES
Off
TP1
Off
On
Jumper function description
Forces drive to use single-ended I/O drivers/receivers only.
Drive can operate on the interface in low voltage differential mode or single-ended, depending on the voltage state of the I/O “DIFFSNS” line. Default is SE jumper not installed.
DS
Off
Off
On
WP
On
Off
41
Spindle starts immediately after power up - Default setting.
Drive spindle does not start until Start Unit command received from host.
Spindle Startup is delayed by SCSI ID times 12 seconds after power is applied, i.e., drive 0
spindle starts immediately when DC power connected, drive 1 starts after 12 second delay,
drive 2 starts after 24 second delay, etc.
Drive spindle starts when Start Unit command received from host. Delayed start feature is
overridden and does not apply when ME jumper is installed.
Entire drive is write protected.
Drive is not write protected. Default is WP jumper not installed.
Parity checking and parity error reporting by the drive is disabled.
Drive checks for parity and reports result of parity checking to host.
Default is PD jumper not installed.
Reserved jumper position. Default is no RES jumper installed.
(Does not apply to “LC” model)
The drive does not supply terminator power to external terminators or to the SCSI bus I/O
cable.
Drive supplies power to SCSI bus I/O cable. When drives have differential I/O circuits, a
jumper on the TP1 position may be needed to power external terminators (see system documentation). These drives do not have terminator circuits on the drive.
42
8.2
Cheetah 18XL Product Manual, Rev. G
Drive orientation
The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive performance characterization, however, has been done with the drive in horizontal (discs level) and vertical (drive on
its side) orientations, and these are the two preferred mounting orientations.
8.3
Cooling
Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding
the drive will not exceed temperature conditions specified in Section 6.4.1, “Temperature.” Specific consideration should be given to make sure adequate air circulation is present around the printed circuit board (PCB) to
meet the requirements of Section 6.4.1, “Temperature.”
8.3.1
Air flow
The rack, cabinet, or drawer environment for the drive must provide heat removal from the electronics and
head and disc assembly (HDA). You should confirm that adequate heat removal is provided using the temperature measurement guidelines described in Section 6.4.1.
Forced air flow may be required to keep temperatures at or below the specified case temperatures of Table 3,
in which case the drive should be oriented, or air flow directed, so that the least amount of air flow resistance is
created while providing air flow to the electronics and HDA. Also, the shortest possible path between the air
inlet and exit should be chosen to minimize the travel length of air heated by the drive and other heat sources
within the rack, cabinet, or drawer environment.
If forced air is determined to be necessary, possible air-flow patterns are shown in Figure 18. The air-flow patterns are created by one or more fans, either forcing or drawing air as shown in the illustrations. Conduction,
convection, or other forced air-flow patterns are acceptable as long as the temperature measurement guidelines of Section 6.4.1 are met.
Above unit
Under unit
Note. Air flows in the direction shown (front to back)
or in reverse direction (back to front)
Above unit
Note. Air flows in the direction shown or
in reverse direction (side to side)
Figure 18.
Air flow (suggested)
Under unit
Cheetah 18XL Product Manual, Rev. G
8.4
43
Drive mounting
When mounting the drive using the bottom holes (x-y plane in Figure 12) care must be taken to ensure that the
drive is not physically distorted due to a stiff non-flat mounting surface. The allowable mounting surface stiffness is 80 lb/in (14.0 N/mm). The following equation and paragraph define the allowable mounting surface stiffness:
k * x = F < 15lb = 67N
where ‘k’ represents the mounting surface stiffness (units of lb/in or N/mm), and ‘x’ represents the out-of-plane
mounting surface distortion (units of inches or millimeters). The out-of-plane distortion (‘x’) is determined by
defining a plane with three of the four mounting points fixed and evaluating the out-of-plane deflection of the
fourth mounting point when a known force (F) is applied to the fourth point.
Note.
8.5
Before mounting the drive in any kind of 3.5-inch to 5.25-inch adapter frame, verify with Seagate Technology that the drive can meet the shock and vibration specifications given herein while mounted in
such an adapter frame. Adapter frames that are available may not have a mechanical structure capable of mounting the drive so that it can meet the shock and vibration specifications listed in this manual.
Grounding
Signal ground (PCBA) and HDA ground are connected together in the drive and cannot be separated by the
user. The equipment in which the drive is mounted is connected directly to the HDA and PCBA with no electrically isolating shock mounts. If it is desired for the system chassis to not be connected to the HDA/PCBA
ground, the systems integrator or user must provide a nonconductive (electrically isolating) method of mounting the drive in the host equipment.
Increased radiated emissions may result if you do not provide the maximum surface area ground connection
between system ground and drive ground. This is the system designer’s and integrator’s responsibility.
44
Cheetah 18XL Product Manual, Rev. G
Cheetah 18XL Product Manual, Rev. G
9.0
45
Interface requirements
This section partially describes the interface requirements as implemented on the drives.
9.1
General description
This section describes in essentially general terms the interface requirements supported by the Cheetah 18XL.
No attempt is made to describe all of the minute details of conditions and constraints that must be considered
by designers when designing a system in which this family of drives can properly operate. Seagate declares
that the drives operate in accordance with the appropriate ANSI Standards referenced in various places herein,
with exceptions as noted herein or in the Seagate SCSI Interface Product Manual , part number 75789509.
9.2
SCSI interface messages supported
Table 5 lists the messages supported by the SCSI-2 and SCSI-3 modes of the Cheetah 18XL family drives.
Table 5:
SCSI messages supported by Cheetah 18XL family drives
Message name
Message code
Supported by
SCSI-2/3
Abort
06h
Y
Abort-tag
0Dh
Y
Bus device reset
0Ch
Y
Clear ACA
16h
N
Clear queue
0Eh
Y
Command complete
00h
Y
Continue I/O process
12h
Y
Disconnect
04h
Y
Extended messages
01h[1]
Y
Identify
80h-FFh
Y
Ignore wide residue (two bytes)
23h
Y
Initiate recovery
0Fh
N
Initiator detected error
05h
Y
Linked command complete
0Ah
Y
Linked command complete with flag
0Bh
Y
Message parity error
09h
Y
Message reject
07h
Y
Modify data pointer
[1]
N
No operation
Parallel Protocol Request
08h
Y
[1] [2]
Y
24h
N
Queue tag messages (two bytes)
ACA
Head of queue tag
21h
Y
Ordered queue tag
22h
Y
Simple queue tag
20h
Y
Release recovery
10h
N
Restore pointers
03h
Y
Save data pointer
02h
Y
Synchronous data transfer req.
[1]
Y
Target transfer disable
13h
Y
Terminate I/O process
11h
Y
Wide data transfer request
[1]
Y
46
Cheetah 18XL Product Manual, Rev. G
Notes.
[1] Extended messages (see the SCSI Interface Product Manual, part number 75789509).
[2] Supports all options except qas_req and iu_req.
9.3
SCSI interface commands supported
Table 6 following lists the SCSI interface commands that are supported by the drive. Cheetah 18XL Family
drives can be changed back and forth between SCSI-1, SCSI-2, and SCSI-3 (Ultra160) modes using the
Change Definition Command. OEM standard drives are shipped set to operate in Ultra160 mode.
Table 6:
Commands supported by Cheetah 18XL family drive
Command name
Change definition
Compare
Copy
Copy and verify
Format unit [1]
DPRY bit supported
DCRT bit supported
STPF bit supported
IP bit supported
DSP bit supported
IMMED bit supported
VS (vendor specific)
Inquiry
Date code page (C1h)
Firmware numbers page (C0h)
Implemented operating def page (81h)
Jumper settings page (C2h)
Supported Vital product data page (00h)
Unit serial number page (80h)
Lock-unlock cache
Log select
PCR bit
DU bit
DS bit
TSD bit
ETC bit
TMC bit
LP bit
Log sense
Application client log page (0Fh)
Cache statistics page (37h)
Factory log page (3Eh)
Non-medium error page (06h)
Pages supported list (00h)
Read error counter page (03h)
Self-test results page (10h)
Start-stop cycle counter page (0Eh)
Temperature page (0Dh)
Verify error counter page (05h)
Write error counter page (02h)
Command
code
Supported by
SCSI-2/3
40h
39h
18h
3Ah
04h
N
N
N
N
Y
N
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
N
Y
Y
N
Y
Y
N
N
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
12h
36h
4Ch
4Dh
Cheetah 18XL Product Manual, Rev. G
Table 6:
47
Commands supported by Cheetah 18XL family drive (Continued)
Command name
Factory log page (3Eh)
Mode select (same pages as Mode Sense 1Ah)
Mode select (10) (same pages as Mode Sense 1Ah)
Mode sense
Caching parameters page (08h)
Control mode page (0Ah)
Disconnect/reconnect (02h)
Error recovery page (01h)
Format page (03h)
Information exceptions control page (1Ch)
Notch and Partition Page (0Ch)
Power condition page (1Ah)
Rigid disc drive geometry page (04h)
Unit attention page (00h)
Verify error recovery page (07h)
Xor Control page (10h)
Mode sense (10) (same pages as Mode Sense 1Ah)
Prefetch
Read
Read buffer (modes 0, 2, 3, Ah and Bh supported)
Read capacity
Read defect data (10)
Read defect data (12)
Read extended
DPO bit supported
FUA bit supported
Read long
Reassign blocks
Receive diagnostic results
Supported diagnostics pages (00h)
Translate page (40h)
Release
Release (10)
Request sense
Actual retry count bytes
Extended sense
Field pointer bytes
Reserve
3rd party reserve
Extent reservation
Reserve (10)
3rd part reserve
Extent reservation
Rezero unit
Search data equal
Search data high
Search data low
Command
code
15h
55h
1Ah
5Ah
34h
08h
3Ch
25h
37h
B7h
28h
3Eh
07h
1Ch
17h
57h
03h
16h
56h
01h
31h
30h
32h
Supported by
SCSI-2/3
Y
Y [2]
Y
Y [2]
Y
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
N
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
Y
N
Y
N
N
N
48
Cheetah 18XL Product Manual, Rev. G
Table 6:
Commands supported by Cheetah 18XL family drive (Continued)
Command name
Seek
Seek extended
Send diagnostics
Supported diagnostics pages (00h)
Translate page (40h)
Set limits
Start unit/stop unit (spindle ceases rotating) (1Ch)
Synchronize cache
Test unit ready
Verify
BYTCHK bit
Write
Write and verify
DPO bit
Write buffer (modes 0, 2, supported)
Firmware download option
(modes 5, 7, Ah and Bh supported) [3]
Write extended
DPO bit
FUA bit
Write long
Write same
PBdata
LBdata
XDRead
XDWrite
XPWrite
[1]
[2]
[3]
Command
code
Supported by
SCSI-2/3
0Bh
2Bh
1Dh
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
33h
1Bh
35h
00h
2Fh
0Ah
2Eh
3Bh
2Ah
3Fh
41h
52h
50h
51h
Y
Y
Y
Y
Y
N
N
N
N
N
The drive can format to any even number of bytes per sector from 512 to 4,096.
Tables 8 and 9 show how individual bits are set and which are changeable by the host.
WARNING: A power loss during flash programming can result in firmware corruption. This usually makes
the drive inoperable.
Cheetah 18XL Product Manual, Rev. G
49
Table 7 lists the Standard Inquiry command data that the drive should return to the initiator per the format given
in the SCSI Interface Product Manual, part number 75789509, Inquiry command section.
Table 7:
Bytes
Data (HEX)
0-15
00
00
[03]1 [12]2 8B
00
[01] [3E]
53
45
41
3
47
41
54
45
20
VENDOR ID
PRODUCT ID
16-31
53
54
[33]
[31] [38] [34] [30] [34]
[4C] [57]
20
20
20
20
20
20
32-47
R#
R#
R#
R#
S#
S#
S#
S#
S#
S#
S#
S#
00
00
00
00
48-63
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
64-79
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
80-95
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
43
6F
96-111
00
70
79
72
69
67
68
74
20
28
63
29
20
[31] COPYRIGHT
112-127
[39] [39] [39]5 20
53
65
61
67
61
74
65
20
41
6C
6C
20
128-143
72
74
73
20
72
65
73
65
72
76
65
64
20
1
[]
[
Cheetah 18XL family drive Standard Inquiry data
]2
69
67
68
NOTICE
03 means SCSI-3 (Ultra160) implemented.
02 means response data in SCSI-3 (Ultra160) format. In addition, 12 indicates that the drive uses the hierarchical addressing mode to assign LUNs to logical units (default is 12).
R# Four ASCII digits representing the last four digits of the product Firmware Release number. This information is also given in the Vital Product Data page C0h, together with servo RAM and ROM release numbers.
S# Eight ASCII digits representing the eight digits of the product serial number.
[ ]3 Bytes 18 through 25 reflect model of drive. The table above shows hex values for Model ST318404LW.
Values for all models are listed below:
ST318404LC
ST39204LW
ST39204LC
33 31 38 34 30 34 4C 43
33 39 32 30 34 4C 57 20
33 39 32 30 34 4C 43 20
[ ]5 Copyright Year - changes with actual year.
9.3.1
Inquiry Vital Product data
Instead of the standard Inquiry data shown in Table 7, the initiator can request several Vital Product Data
pages by setting the Inquiry command EVPD bit to one. The SCSI Interface Product Manual, part number
75789509, lists the Vital Product Data pages and describes their formats. A separate Inquiry command must
be sent to the drive for each Vital Product Data page the initiator wants the drive to send back.
50
Cheetah 18XL Product Manual, Rev. G
9.3.2
Mode Sense data
The Mode Sense command provides a means for the drive to report its operating parameters to the initiator.
The drive maintains four sets of Mode parameters, Default values, Saved values, Current values and Changeable values.
Default values are hard coded in the drive firmware that is stored in flash EPROM nonvolatile memory on the
drive PCBA. Default values can be changed only by downloading a complete set of new firmware into the flash
EPROM. An initiator can request and receive from the drive a list of default values and use those in a Mode
Select command to set up new current and saved values, where the values are changeable.
Saved values are stored on the disk media using a Mode Select command. Only parameter values that are
allowed to be changed can be changed by this method. See “Changeable values” defined below. Parameters in
the saved values list that are not changeable by the Mode Select command get their values from the default
values storage.
Current values are volatile values currently being used by the drive to control its operation. A Mode Select command can be used to change these values (only those that are changeable). Originally, they are installed from
saved or default values after a power on reset, hard reset, or Bus Device Reset message.
Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the current values and
saved values can be changed by a Mode Select command. A “one” allows a change to a corresponding bit; a
“zero” allows no change. For example, in Table 8 refer to Mode page 01, in the row entitled “CHG”. These are
hex numbers representing the changeable values for mode page 01. Note that bytes 04, 05, 06, and 07 are not
changeable, because those fields are all zeros. If some changeable code had a hex value EF, that equates to
the binary pattern 1110 1111. If there is a zero in any bit position in the field, it means that bit is not changeable. Bits 7, 6, 5, 3, 2, 1, and 0 are changeable, because those bits are all ones. Bit 4 is not changeable.
Though the drive always reports non-zero values in bytes 00 and 01, those particular bytes are never changeable.
The Changeable values list can only be changed by downloading new firmware into the flash EPROM.
On standard OEM drives the Saved values are taken from the default values list and stored into the saved values storage location on the media prior to shipping.
When a drive is powered up, it takes saved values from the media and stores them to the current values storage in volatile memory. It is not possible to change the current values (or the saved values) with a Mode Select
command before the drive is up to speed and is “ready.” An attempt to do so results in a “Check Condition status being returned.
Note.
Because there may be several different versions of drive control firmware in the total population of
drives in the field, the Mode Sense values given in the following tables may not exactly match those of
some drives.
The following tables list the values of the data bytes returned by the drive in response to the Mode Sense command pages for SCSI Ultra160 implementation (see the SCSI Interface Product Manual, part number
75789509).
Definitions:
SAV = Saved value.
DEF = Default value. Standard drives are shipped configured this way.
CHG= Changeable bits; indicates if current and saved values are changeable.
Note.
Saved values for OEM drives are normally the same as the default values.
Cheetah 18XL Product Manual, Rev. G
Table 8:
51
Mode sense data, ST318404 values
Bytes
00 01 02
03 04 05 06 07 08 09 10 11 12
Mode
Sense
Data
9F 00 10
08 02 22 EE 56 00 00 02 00
Mode
Page
13
14 15 16 17 18 19 20 21 22 23
<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->
01 SAV 81 0A C0
0B F0 00 00 00 0F 00 FF FF
01 DEF 81 0A C0
0B F0 00 00 00 0F 00 FF FF
01 CHG 00 0A FF
FF 00 00 00 00 FF 00 FF FF
02 SAV 82 0E 80
80 00 0A 00 00 00 00 00 00 00
00
00 00
02 DEF 82 0E 80
80 00 0A 00 00 00 00 00 00 00
00
00 00
02 CHG 00 0E FF
FF 00 00 00 00 00 00 00 00 87
00
00 00
03 SAV 83 16 14
76 00 00 00 0f
00 00 01 A5 02
00
00 01 00 4B 00 55 40 00 00 00
03 DEF 83 16 14
76 00 00 00 0f
00 00 01 A5 02
00
00 01 00 4B 00 55 40 00 00 00
03 CHG 00 16 00
00 00 00 00 00 00 00 00 00 00
00
00 00 00 00 00 00 00 00 00 00
04 SAV 84 16 00
38 30 06 00 00 00 00 00 00 00
00
00 00 00 00 00 00 27 20 00 00
04 DEF 84 16 00
38 30 06 00 00 00 00 00 00 00
00
00 00 00 00 00 00 27 20 00 00
04 CHG 00 16 00
00 00 00 00 00 00 00 00 00 00
00
00 00 00 00 00 00 00 00 00 00
07 SAV 87 0A 00
0B F0 00 00 00 00 00 FF FF
07 DEF 87 0A 00
0B F0 00 00 00 00 00 FF FF
07 CHG 00 0A 0F
FF 00 00 00 00 00 00 FF FF
08 SAV 88 12 14
00 FF FF 00 00 FF FF FF FF 80
[3]
00 00 00 00 00 00
08 DEF 88 12 14
00 FF FF 00 00 FF FF FF FF 80
[3]
00 00 00 00 00 00
08 CHG 00 12 B5
00 00 00 FF FF FF FF 00 00 A0
FF
00 00 00 00 00 00
0A SAV 8A 0A 02
00 00 00 00 00 00 00 02 B3
0A DEF 8A 0A 02
00 00 00 00 00 00 00 02 B3
0A CHG 00 0A 03
F1 00 00 00 00 00 00 00 00
1A SAV 9A 0A 00
03 00 00 00 01 00 00 00 04
1A DEF 9A 0A 00
03 00 00 00 01 00 00 00 04
1A CHG 00 0A 00
03 00 00 00 00 00 00 00 00
1C SAV 9C 0A 00
00 00 00 00 00 00 00 00 01
1C DEF 9C 0A 00
00 00 00 00 00 00 00 00 01
1C CHG 00 0A 8D
0F FF FF FF FF FF FF FF FF
00 SAV 80 02 [2]
00
00 DEF 80 02 [2]
00
00 CHG 00 02 FF
40
Read capacity data
02 22 EE
[1]
[2]
55 00 00 02 00
Though byte 12, bit 7 (A0) is shown as changeable, the FSW function governed by that bit is not implemented by this drive.
Page 0, Byte 2, Bit 7 is defined as the Performance Mode (PM) bit. When set to zero (Server mode), the
SCSI firmware is performance optimized for server applications. When the bit is set to one (Desktop
52
[3]
Cheetah 18XL Product Manual, Rev. G
mode), the SCSI firmware is performance optimized for desktop applications. The firmware default condition for the PM bit is set to one for Desktop mode. During the manufacturing process, the Saved value of
the PM bit remains set to the firmware default condition (one) for drives with the LW interface. Drives manufactured with all other interfaces (LC) set the Saved value of the PM bit set to the Server mode (zero).
When the Performance Mode bit (Page 0, Byte 2, Bit 7) is set to Server mode (zero), the Number of
Cache Segments should be set to three (03h). When the Performance Mode bit (Page 0, Byte 2, Bit 7) is
set to Desktop mode (one), the Number of Cache Segments should be set to sixteen (10h).
Cheetah 18XL Product Manual, Rev. G
Table 9:
53
Mode sense data, ST39204 values
Bytes
00
01
02
03 04 05 06 07 08 09 10 11 12
Mode
Sense
Data
9F
00
10
08 01 11 77 2B 00 00 02 00
Mode
Page
13
14 15 16 17 18 19 20 21 22 23
<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->
01 SAV
81
0A
C0
0B F0 00 00 00 0F 00 FF FF
01 DEF
81
0A
C0
0B F0 00 00 00 0F 00 FF FF
01 CHG
00
0A
FF
FF 00 00 00 00 FF 00 FF FF
02 SAV
82
0E
80
80 00 0A 00 00 00 00 00 00 00
00
00 00
02 DEF
82
0E
80
80 00 0A 00 00 00 00 00 00 00
00
00 00
02 CHG
00
0E
FF
FF 00 00 00 00 00 00 00 00 87
00
00 00
03 SAV
83
16
0A
3B 00 00 00 0F 00 00 01 A5 02
00
00 01 00 4B 00 55 40 00 00 00
03 DEF
83
16
0A
3B 00 00 00 0F 00 00 01 A5 02
00
00 01 00 4B 00 55 40 00 00 00
03 CHG
00
16
00
00 00 00 00 00 00 00 00 00 00
00
00 00 00 00 00 00 00 00 00 00
04 SAV
84
16
00
38 30 03 00 00 00 00 00 00 00
00
00 00 00 00 00 00 27 20 00 00
04 DEF
84
16
00
38 30 03 00 00 00 00 00 00 00
00
00 00 00 00 00 00 27 20 00 00
04 CHG
00
16
00
00 00 00 00 00 00 00 00 00 00
00
00 00 00 00 00 00 00 00 00 00
07 SAV
87
0A
00
0B F0 00 00 00 00 00 FF FF
07 DEF
87
0A
00
0B F0 00 00 00 00 00 FF FF
07 CHG
00
0A
0F
FF 00 00 00 00 00 00 FF FF
08 SAV
88
12
14
00 FF FF 00 00 FF FF FF FF 80
[3]
00 00 00 00 00 00
08 DEF
88
12
14
00 FF FF 00 00 FF FF FF FF 80
[3]
00 00 00 00 00 00
08 CHG
00
12
B5
00 00 00 FF FF FF FF 00 00 A0
FF
00 00 00 00 00 00
0A SAV
8A
0A
02
00 00 00 00 00 00 00 01 A3
0A DEF
8A
0A
02
00 00 00 00 00 00 00 01 A3
0A CHG
00
0A
03
F1 00 00 00 00 00 00 00 00
1A SAV
9A‘ 0A
00
03 00 00 00 01 00 00 00 04
1A DEF
9A‘ 0A
00
03 00 00 00 01 00 00 00 04
1A CHG
00
0A
00
03 00 00 00 00 00 00 00 00
1C SAV
9C
0A
00
00 00 00 00 00 00 00 00 01
1C DEF
9C
0A
00
00 00 00 00 00 00 00 00 01
1C CHG
00
0A
8D
0F FF FF FF FF FF FF FF FF
00 SAV
80
02
[2]
00
00 DEF
80
02
[2]
00
00 CHG
00
02
FF
40
77
2A 00 00 02 00
Read capacity data
01
[1]
[2]
11
Though byte 12, bit 7 (A0) is shown as changeable, the FSW function governed by that bit is not implemented by this drive.
Page 0, Byte 2, Bit 7 is defined as the Performance Mode (PM) bit. When set to zero (Server mode), the
SCSI firmware is performance optimized for server applications. When the bit is set to one (Desktop
54
[3]
Cheetah 18XL Product Manual, Rev. G
mode), the SCSI firmware is performance optimized for desktop applications. The firmware default condition for the PM bit is set to one for Desktop mode. During the manufacturing process, the Saved value of
the PM bit remains set to the firmware default condition (one) for drives with the LW interface. Drives manufactured with all other interfaces (LC) set the Saved value of the PM bit set to the Server mode (zero).
When the Performance Mode bit (Page 0, Byte 2, Bit 7) is set to Server mode (zero), the Number of
Cache Segments should be set to three (03h). When the Performance Mode bit (Page 0, Byte 2, Bit 7) is
set to Desktop mode (one), the Number of Cache Segments should be set to sixteen (10h).
Cheetah 18XL Product Manual, Rev. G
9.4
55
SCSI bus conditions and miscellaneous features supported
Asynchronous SCSI bus conditions supported by the drive are listed below. These conditions cause the SCSI
device to perform certain actions and can alter the SCSI bus phase sequence. Other miscellaneous operating
features supported are also listed here. Refer to the SCSI Interface Product Manual, part number 75789509,
for details.
Table 10:
SCSI bus conditions and other miscellaneous features
Condition/features supported:
SCSI-2/SCSI-3
Conditions or feature
Y
Adaptive Caching
Y
Arbitrating System
Y
Asynchronous Data Transfer
N
Asynchronous Event Notification
Y
Attention Condition
N
Auto Contingent Allegiance Condition
Y
Contingent Allegiance Condition
Y
Deferred Error Handling
Y
Disconnect/Reconnect
N
High voltage differential (HVD) interface available
Y
Low voltage differential (LVD) interface available
Y
Parameter Rounding (controlled by the Round bit in Mode Select page 0)
Y
Queue tagging (up to 64 Queue tags supported)
Y
Reporting actual retry count in Extended Sense bytes 15, 16 and 17.
Y
Reset Condition
Y
Segmented Caching
Y
Synchronous Data Transfer
N
Zero Latency Read
SCSI-2/SCSI-3
Status supported
Y
Good
Y
Check Condition
Y
Condition Met/Good
Y
Busy
Y
Intermediate/Good
Y
Intermediate/Condition Met/Good
Y
Reservation Conflict
Y
Queue Full
N
ACA Active
56
Cheetah 18XL Product Manual, Rev. G
9.5
Synchronous data transfer
9.5.1
Synchronous data transfer periods supported
Table 11 and Section 9.5.2 list Synchronous Data transfer periods supported by the drive. The data transfer
period to be used by the drive and the initiator is established by an exchange of messages during the Message
Phase of operation. See the section on message protocol in the SCSI Interface Product Manual, part number
75789509.
Table 11:
Synchronous data transfer periods
M (decimal)
Transfer period
(nanoseconds)
Transfer rate
(megatransfers/second)
10
12
25
50
25
50
100
200
40.0 [1]
20.0
10.0
5.0
[1]
This transfer rate is only allowed when using the LVD interface.
9.5.2
REQ/ACK offset
The maximum value supported by the Cheetah 18XL family drives for REQ/ACK offset is 63 (3Fh).
9.6
Physical interface
This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O
interface. See Section 9.8 and Section 9.9 for additional terminator information.
Figures 19 and 20 show the locations of the DC power connector, SCSI interface connector, drive select headers, and option select headers.
Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI
operational aspects of Seagate drive interfaces are given in the SCSI Interface Product Manual, part number
75789509.
9.6.1
DC cable and connector
ST318404LW drives receive DC power through a 4 pin connector (see Figure 21 for pin assignment) mounted
at the rear of the main PCBA. Recommended part numbers of the mating connector are listed below, but equivalent parts may be used.
Type of cable
Connector
Contacts (20-14 AWG)
14 AWG
MP 1-480424-0
AMP 60619-4 (Loose Piece)
AMP 61117-4 (Strip)
LC model drives receive power through the 80-pin I/O connector. See Tables 15 and 16.
Cheetah 18XL Product Manual, Rev. G
57
Pin
1P
2P
3P
4P
J1
Pin 1
Power
+12V
+12V ret
+ 5V ret
+ 5V
J5
Pin 1
J1-DC Power
4P
3P
2P
1P
PCBA
J1-DC Power
J5
Pin 1
Pin 1P
J1
Pin 1
68 Pin
SCSI I/O
Connector
J2
J6
Figure 19.
LW model drive physical interface (68-pin J1 SCSI I/O connector)
J1
80 Pin SCSI I/O
and Power
Connector
Pin 1
J6
Figure 20.
LC model drive physical interface (80-pin J1 SCSI I/O connector)
58
Cheetah 18XL Product Manual, Rev. G
9.6.2
SCSI interface physical description
The drive models described by this product manual support the physical interface requirements of the Ultra160
SCSI Parallel Interface-3 (SPI-3) standards as defined in American National Standard document X3T10/1302D
revision 14, and operate compatibly at the interface with devices that support earlier SCSI-2 and SCSI-3 standards. It should be noted that this is only true if the systems engineering has been correctly done, and if earlier
SCSI-2 and SCSI-3 devices respond in an acceptable manner (per applicable SCSI Standards) to reject newer
Ultra160 SCSI protocol extensions that they don’t support.
The drives documented in this manual support single-ended and low voltage differential physical interconnects
(hereafter referred to as SE and LVD, respectively) as described in the ANSI SPI-3 standard. These drives
implement driver and receiver circuits that can operate either SE or LVD. However, they cannot switch dynamically between SE and LVD operation.
The drives typically operate on a daisy-chain interface in which other SCSI devices are also operating. Devices
on the daisy chain must all operate in the same mode, either SE or LVD, but not a mixture of these. On the
interface daisy chain, all signals are common between all devices on the chain, or bus, as it is also called. This
daisy chain of SCSI devices must be terminated at both ends with the proper impedance in order to operate
correctly. Do not terminate intermediate SCSI devices. In some cases, the SCSI devices at each end have
onboard termination circuits that can be enabled by installation of a jumper plug (TE) on the device. These termination circuits receive power from either a source internal to the device, or from a line in the interface cable
specifically powered for that purpose. LC and LW model drives do not have onboard termination circuits. Some
type of external termination circuits must be provided for these drives by the end user or designers of the
equipment into which the drives will be integrated. See Standard X3T10/1302D, sections 6.4 and 6.5 for the
maximum number of devices that can successfully operate at various interface transfer rates on SE and LVD
daisy chains.
“LC” model drives plug into PCBA or bulkhead connectors in the host. They may be connected in a daisy-chain
by the host backplane wiring or PCBA circuit runs that have adequate DC current carrying capacity to support
the number of drives plugged into the PCBA or bulkhead connectors. A single 80-pin I/O connector cable cannot support the DC current needs of several drives, so no daisy chain cables beyond the bulkhead connectors
should be used. A single drive connected via a cable to a host 80-pin I/O connector is not recommended.
Table 12 shows the interface transfer rates supported by the various drive models defined in this manual.
Table 12:
Interface transfer rates supported
Interface type/
drive models
Maximum transfer rate
Asynchronous Fast-5
Fast-10
Fast-20
Fast-40
Fast-80
SE
ST318404LW/LC
ST39204LW/LC
yes
yes
yes
yes
no
no
LVD
ST318404LW/LC
ST39204LW/LC
yes
yes
yes
yes
yes
yes
9.6.3
SCSI interface cable requirements
The characteristics of cables used to connect Ultra160 SCSI parallel interface devices are discussed in detail
in section 6 of ANSI Standard X3T10/1302D. The cable characteristics that must be considered when interconnecting the drives described in this manual in a Ultra160 SCSI parallel, daisy-chain interconnected system are:
•
•
•
•
•
characteristic impedance (see Section 6.1)
propagation delay (see Section 6.1)
cumulative length (see Sections 6.4 and 6.5)
stub length (see Sections 6.4 and 6.5)
device spacing (see Sections 6.4 and 6.5)
To minimize discontinuances and signal reflections, cables of different impedances should not be used in the
same bus. Implementations may require trade-offs in shielding effectiveness, cable length, number of loads
Cheetah 18XL Product Manual, Rev. G
59
and spacing, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded
cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered.
Proper impedance matching is especially important in order to maintain adequate margin at FAST-20 and
FAST-40 SCSI transfer rates.
Note.
For LVD operation, twisted pair cables are recommended. For LVD Fast-40 operation, twisted pair
cables are strongly recommended. For Fast-80 operation, twisted pair cables are required.
ST318404LC/ST39204LC:
The 80-pin connector option is intended for use on drives that plug directly into backplane connector in the host
equipment. In such installations, all backplane wiring segments are subject to the electromagnetic concepts
presented in Standard X3T10/1302D, section 6. For LC model drives, installations with connectors on cables
are not recommended.
9.6.4
Mating connectors
Part numbers for the different type connectors that mate with the various Cheetah 18XL I/O connectors are
given in the sections following.
9.6.4.1
Mating connectors for LW model drives
The nonshielded cable connector shall be a 68 conductor connector consisting of two rows of 34 male contacts
with adjacent contacts 0.050 inch (1.27 mm) apart.
Recommended mating flat cable connector part numbers are:
Amp Model 786096-7
Female, 68-pin, panel mount
Amp Model 786090-7
Female, 68-pin, cable mount
Amp Model 749925-5
(50 mil conductor centers, 28 or 30 AWG wire)
Use two, 34 conductor, 50 mil center flat cable with this connector.
This type connector can only be used on cable ends. [1]
Amp Model 88-5870-294-5 W/O Strain Relief (25 mil conductor centers, 30 AWG wire).
Use either on cable ends or in cable middle section for daisy-chain
installations [1].
Amp Model 1-480420-0
Power connector 4 circuit housing
Berg 69307-012
12-position, 2 x 6, 2 mm receptacle housing
[1]
See Figure 21.
The drive device connector is a nonshielded 68 conductor connector consisting of two rows of 34 female pins
with adjacent pins 50 mils apart. The connector is keyed by means of its shape (see Figure 22).
9.6.4.2
Mating connectors for LC model drives
The nonshielded connector shall be an 80-conductor connector consisting of two rows of 40 contacts with adjacent contacts 50 (1.27 mm) mils apart (see Figure 23). I/O connection using a cable is not recommended. The
length and size of the host equipment DC power carrying conductors from the DC power source to the host
equipment 80-pin disk drive interface connector(s) should be strictly designed according to proper power transmission design concepts. No possibility for the equipment user to attach an 80-pin cable/connector should be
allowed, since the length of the DC power carrying conductors could not be controlled and therefore could
become too long for safe power transmission to the drive. Daisy-chain 80-conductor cables should especially
not be allowed, since the power-carrying conductors on the 80-conductor interface were not intended to support a series of drives.
To insure that both drive connector and host equipment mating connector mate properly, both drive connector
and host equipment mating connector must meet the provisions of “SFF-8451, Specification for SCA-2
Unshielded Connections.”
60
Cheetah 18XL Product Manual, Rev. G
Recommended mating 80-position PCBA mount connectors:
Straight-in connector
Seagate P/N:
Amp US P/N:
or
Amp US P/N:
or
Amp Japan P/N:
Hot plug version (with ground guide-pin)
77678703
2-557103-1
94-0680-02-1
2-557103-2
94-0680-02-2
5-175475-9
787311-1
with polarization
787311-2
without polarization
Right-angle to PCBA connectors
Seagate P/N: 77678559
Amp US P/N: 2-557101-1
Amp Japan P/N:
5-175474-9
For additional information call Amp FAX service at 1-800-522-6752.
“LW” Model
Drive
Note. Do not mix drives operating
single-ended with drives
operating differential on the
daisy chain.
[6]
Terminator
[1]
2 through X
SCSI devices [4]
Pin 1
(check your
adapter for Pin 1 location)
SCSI ID 1
SCSI ID 7 [5]
[2]
[1]
SCSI ID 0
Host Adapter
PCBA
[2]
[3]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
Closed end type 68-pin connector used. Terminators enabled.
Open end type (in-line application) connector used.
Host need not be on the end of the daisy-chain. Another device can be on the end with the terminator, the
host having no terminator.
Total interface cable length must not exceed that specified in ANSI document X3T10/1302D (including
host adapter/initiator). The cable length restriction limits the total number of devices allowed.
SCSI ID7 has highest arbitration priority, then ID15 to ID8 (ID 8 very lowest).
Last drive on the daisy chain.
Open-end type 68-pin connector used. If end device, use external terminator and closed-end type 68-pin
connector.
Figure 21.
SCSI daisy chain interface cabling for LW drives
Cheetah 18XL Product Manual, Rev. G
61
3.650±.005
.346
.155
1.650
.270
.3937
.050
.600
.0787
.022
.200
.020
.047
.60
(15.24)
.519
(13.18)
.100
(2.54)
1.816
(46.13)
.315
(8.00)
Position 1
Pos.
1
.20 typ
(5.08)
32
4
.218
(5.54)
.050
(1.27)
Pos. 35
1.650
(41.91)
.0787
(2.00)
Pos. 68
.980
(24.89)
1.368
(37.74)
.840 ± .005
(21.34)
Pos.
2
3.650
(92.71)
Figure 22.
Nonshielded 68 pin SCSI device connector used on LW drives
.085 x 45° chamfer
(2.16)
typ
Pos.
1
.767
(19.48)
1
.315 ± .010
(8.00)
+.001
.083 –.002 dia
(2.1)
Trifurcated Pins
(4 places)
62
Cheetah 18XL Product Manual, Rev. G
7.00
(.276)
12.70
(.500)
End View
Grounding
Pins
2.15±0.10
2 places
57.87 0
(2.278) –0.15
+ .000
[ – .006 [
0.15 M Y M
–Y–
CL of Datum Y
Front View
Pin 1
62.15 ± 0.15
(2.447) (± .005)
0.15 M Y M
Insert mating
I/O connector
Housing
X
Top View
Contact
0.50
(.020)
0.3 M Y M
(.012)
Pin 1
1.27
(.05)
Typ
X
CL of Datum Y
Grounding
Pins
Pin 40
Back View
Pin 41
Figure 23.
Pin 80
Nonshielded 80 pin SCSI “SCA-2” connector, used on LC drives
Cheetah 18XL Product Manual, Rev. G
Table 13:
Note.
63
LW 68-conductor single-ended (SE) P cable signal/pin assignments [11]
A minus sign preceding a signal name indicates that signal is active low.
Signal
name [1]
Connector
contact
number [3]
Cable conductor
number [2]
Connector
contact
number [3]
Signal
name [1]
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
TermPwr
TermPwr
Reserved
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
–DB12
–DB13
–DB14
–DB15
–DBP1
–DB0
–DB1
–DB2
–DB3
–DB4
–DB5
–DB6
–DB7
–DBP
GND
GND
TermPwr
TermPwr
Reserved
GND
–ATN
GND
–BSY
–ACK
–RST
–MSG
–SEL
–C/D
–REQ
–I/O
–DB8
–DB9
–DB10
–DB11
Notes [ ]: See page following Table 16.
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
64
Cheetah 18XL Product Manual, Rev. G
Table 14:
Note.
LW 68-conductor LVD P cable signal/pin assignments [11]
A minus sign preceding a signal name indicates that signal is active low.
Signal
name [1]
Connector
contact
number [3]
Cable conductor
number [2]
Connector
contact
number [3]
Signal
name [1]
+DB12
+DB13
+DB14
+DB15
+DBP1
+DB0
+DB1
+DB2
+DB3
+DB4
+DB5
+DB6
+DB7
+DBP
Ground
DIFFSNS [8]
TermPwr
TermPwr
Reserved
Ground
+ATN
Ground
+BSY
+ACK
+RST
+MSG
+SEL
+C/D
+REQ
+I/O
+DB8
+DB9
+DB10
+DB11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
67
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
–DB12
–DB13
–DB14
–DB15
–DBP1
–DB0
–DB1
–DB2
–DB3
–DB4
–DB5
–DB6
–DB7
–DBP
Ground
Ground
TermPwr
TermPwr
Reserved
Ground
–ATN
Ground
–BSY
–ACK
–RST
–MSG
–SEL
–C/D
–REQ
–I/O
–DB8
–DB9
–DB10
–DB11
Notes [ ]: See page following Table 16.
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
Cheetah 18XL Product Manual, Rev. G
Table 15:
Note.
65
LC 80-pin single-ended (SE) I/O connector pin assignments [11]
A minus sign preceding a signal name indicates that signal is active low.
Signal
name [1]
Connector
contact
number [3]
Signal
number [3]
Contact
name[1]
12 V CHARGE
12 V
12 V
12 V
NC [10]
NC [10]
–DB11
–DB10
–DB9
–DB8
–I/O
–REQ
–C/D
–SEL
–MSG
–RST
–ACK
–BSY
–ATN
–DBP
–DB7
–DB6
–DB5
–DB4
–DB3
–DB2
–DB1
–DB0
–DP1
–DB15
–DB14
–DB13
–DB12
+5 V
+5 V
+5 V
NC [10]
RMT-START [5] [9]
SCSI ID (0) [7] [9]
SCSI ID (2) [7] [9]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
12 V GND
12 V GND
12 V GND
MATED 1
NC [10]
DIFFSNS [8]
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
MATED 2
5 V GND
5 V GND
ACTIVE LED OUT [4] [9]
DLYD-START [6] [9]
SCSI ID (1) [7] [9]
SCSI ID (3) [7] [9]
Notes [ ]: See page following Table 16.
66
Cheetah 18XL Product Manual, Rev. G
Table 16:
Note.
LC 80-pin single-ended (LVD) I/O connector pin assignments [11]
A minus sign preceding a signal name indicates that signal is active low.
Signal
name [1]
Connector
contact
number [3]
Signal
number [3]
Contact
name[1]
12 V CHARGE
12 V
12 V
12 V
NC [10]
NC [10]
–DB11
–DB10
–DB9
–DB8
–I/O
–REQ
–C/D
–SEL
–MSG
–RST
–ACK
–BSY
–ATN
–DBP
–DB7
–DB6
–DB5
–DB4
–DB3
–DB2
–DB1
–DB0
–DBP1
–DB15
–DB14
–DB13
–DB12
+5 V
+5 V
+5 V CHARGE
NC [10]
RMT_START [5] [9]
SCSI ID (0) [7] [9]
SCSI ID (2) [7] [9]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
12 V GND
12 V GND
12 V GND
MATED 1
NC [10]
DIFFSNS [8]
+DB11
+DB10
+DB9
+DB8
+I/O
+REQ
+C/D
+SEL
+MSG
+RST
+ACK
+BSY
+ATN
+DBP0
+DB7
+DB6
+DB5
+DB4
+DB3
+DB2
+DB1
+DB0
+DP1
+DB15
+DB14
+DB13
+DB12
MATED 2
5 V GND
5 V GND
ACTIVE LED OUT [4] [9]
DLYD_START [6] [9]
SCSI ID (1) [7] [9]
SCSI ID (3) [7] [9]
Notes [ ]: See page following this table.
Cheetah 18XL Product Manual, Rev. G
67
Notes [ ] for Tables 13 through 16.
[1]
[2]
See Section 9.6.4.1 for detailed electrical characteristics of these signals.
The conductor number refers to the conductor position when using 0.025-inch (0.635 mm) centerline flat
ribbon cable. Other cables types may be used to implement equivalent contact assignments.
[3] Connector contacts are on 0.050 inch (1.27 mm) centers.
[4] Front panel LED signal; indicates drive activity for host front panel hard drive activity indicator.
[5] Asserted by host to enable Motor Start option (enables starting motor via SCSI bus command).
[6] Asserted by host to enable Delayed Motor Start option (motor starts at power on or after a delay of 12 seconds times drive ID). This and [3] above are mutually exclusive options.
[7] Binary code on A3, A2, A1 and A0 asserted by host to set up SCSI bus ID in drive.
[8] GND provides a means for differential devices to detect the presence of a single ended device on the bus.
Drive will not operate I/O bus at Ultra2 SCSI data rates if this is grounded.
[9] Signals [4] through [7] are used in place of installing jumpers and cables on option select connectors J2
and J6. See Section 8.1.1 notes.
[10] “NC” means no connection.
[11] 8 bit devices which are connected to the 16 data bit LVD I/O shall leave the following signals open: –DB8,
–DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.
8 bit devices which are connected to the 16 data bit single-ended (SE) I/O shall have the following signals
open: DB8, –DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.
All other signals should be connected as shown.
9.7
Electrical description
Cheetah 18XL LW and LC model drives are multimode devices. That is, their I/O circuits can operate as either
single-ended or low voltage differential drivers/receivers (selectable using the I/O “DIFFSENS” line).
See ANSI Standard X3T10/1302D for details electrical specifications.
9.7.1
Multimode—SE and LVD alternatives
When the interface “DIFFSNS” line is between +0.35 V and +0.5 V, the drive interface circuits operate singleended and up to and including 20 M transfers/s (Fast-20 or Ultra SCSI). When “DIFFSNS” is between +0.7 V
and +1.9 V, the drive interface circuits operate low voltage differential and up to and including 160 M transfers/s
or less (Fast-160 or Ultra160 SCSI).
This multimode design does not allow dynamically changing transmission modes. Drives must operate only in
the mode for which the installation and interface cabling is designed. Multimode I/O circuits used by these
drives do not operate at high voltage differential levels and should never be exposed to high voltage differential
environments unless the common mode voltages in the environment are controlled to safe levels for singleended and low voltage differential devices (see the ANSI SPI-3 specification X3T10/1302D).
Multimode signals
Multimode circuit SE alternative signal characteristics are the same as described elsewhere in Section 9.7.1.
The SE alternative for these circuits is selected as described above. SE cables and termination must be used.
LC and LW model drives do not have onboard terminators. The Multimode signal lines (either SE or LVD)
should be terminated with 110 ohm active terminator circuits at each end of the total cable. Termination of the
I/O lines must be provided for by the Host equipment designers or end users.
The SE and differential alternatives are mutually exclusive.
Output characteristics
Each signal (Vs) driven by LVD interface drivers shall have the following output characteristics when measured
at the disc drive connector:
Steady state Low level output voltage* = –.95 V = < Vs = < –1.55 V (signal negation/logic 0)
Steady state High level output voltage* = –.95 V = < Vs = < 1.55 V (signal assertion/logic 1)
Differential voltage = +0.6 V minimum with common-mode voltage ranges 0.700 V = < Vcm = < 1.800 V.
*These voltages shall be measured between the output terminal and the SCSI device’s logic ground reference.
68
Cheetah 18XL Product Manual, Rev. G
The output characteristics shall additionally conform to EIA RS-485.
100Ω
–SIGNAL
STEADY STATE
LOGIC INPUT
(1 OR 0)
V1
Vs
D
75Ω
100Ω
V2
+SIGNAL
MEASURED
PARAMETER
DEVICE CONNECTOR
Figure 24.
LVD output signals
Input characteristics
Each signal (Vs) received by LVD interface receiver circuits shall have the following input characteristics when
measured at the disk drive connector:
Steady state Low level output voltage* = 0.030 V = < Vs = < 3.6 V (signal negation/logic 0)
Steady state High level output voltage* = –3.6 V = < Vs = < –0.030 V (signal assertion/logic 1)
Differential voltage = +0.30 V minimum with common-mode voltage ranges 0.700 V = < Vcm = < 1.800 V.
(X3T10/1302D)
*These voltages shall be measured between the output terminal and the SCSI device’s logic ground reference.
Input characteristics shall additionally conform to EIA RS-485-983.
VCCA
Single
Ended
Circuitry
LVD Signal Drivers
VCCB
Single
Ended
Receiver
LVD
Receiver
Single
Ended
Ground
Driver
Single
Ended
Assertion
Driver
LVD Signal Drivers
Ground
Single Ended: GND
LVD:
+Signal
Figure 25.
Single
Ended
Negation
Driver
Typical SE-LVD alternative transmitter receiver circuits
–Signal
–Signal
Cheetah 18XL Product Manual, Rev. G
9.7.1.1
69
Single-ended drivers/receivers
The maximum total cable length allowed with drives using single-ended I/O driver and receiver circuits
depends on several factors. Table 17 lists the maximum lengths allowed for different configurations of drive
usage. These values are from the SPI-3 document. All device I/O lines must have equal to or less than 25 pf
capacitance to ground, measured at the beginning of the stub.
Table 17:
Cable characteristics for single-ended circuits
Transmission line impedance
I/O transfer rate
Maximum number of
devices on the bus
maximum cable
length allowed
REQ/ACK
Other signals
<10M transfers/s
16 (wide SCSI bus)
6 meters (19.7 ft)
90 + 6 Ohms
90 + 10 Ohms
<20M transfers/s
4 (wide SCSI bus)
3 meters (9.8 ft)
90 + 6 Ohms
90 + 10 Ohms
<20M transfers/s
8 (wide SCSI bus)
1.5 meters (4.9 ft)
90 + 6 Ohms
90 + 10 Ohms
A stub length of no more than 0.1 meter (0.33 ft) is allowed off the mainline interconnection with any connected
equipment. The stub length is measured from the transceiver to the connection to the mainline SCSI bus.
Single-ended I/O cable pin assignments for LW drives are shown in Table 14.
Single-ended I/O pin assignments for the LC model are shown in Table 15. The LC model does not require an
I/O cable. It is designed to connect directly to a back panel connector.
9.7.1.2
Low voltage differential I/O circuits
The maximum total cable length for use with drives using LVD I/O drivers and receiver circuits is 12 meters
(39.37 ft.). A stub length of no more than 0.1 meter is allowed off the mainline interconnection with any connected equipment. LVD I/O pin assignments for LW model drives are shown in tables 13 and 14. LVD I/O pin
assignments for LC model drives are shown in tables 15 and 16.
9.7.1.3
General cable characteristics
A characteristic impedance of 100 ohm + 10% is recommended for unshielded flat or twisted pair ribbon cable.
However, most available cables have a somewhat lower characteristic impedance. To Minimize discontinuities
and signal reflections, cables of different impedances should not be used in the same bus. Implementations
may require trade-offs in shielding effectiveness, cable length, the number of loads, transfer rates, and cost to
achieve satisfactory system operation. If shielded and unshielded cables are mixed within the same SCSI bus,
the effect of impedance mismatch must be carefully considered. Proper impedance matching is especially
important in order to maintain adequate margin at fast SCSI transfer rates.
9.8
Terminator requirements
Caution: These drives do not have onboard internal terminators. The user, systems integrator or host equipment manufacturer must provide a terminator arrangement external to the drive when termination is
required. For LW drives, terminator modules can be purchased that plug between the SCSI I/O
cable and the drive I/O connector or on the end of a short I/O cable stub extending past the last
cable connector. LC drives are designed to be plugged into a backpanel connector without cabling.
9.9
Terminator power
LW drives
You can configure terminator power from the drive to the SCSI bus or have the host adaptor or other device
supply terminator power to the external terminator. See Section 8.1 for illustrations that show how to place
jumpers for this configuration.
LC drives
These drives cannot furnish terminator power because no conductors in the 80-pin I/O connector are devoted
to terminator power.
70
Cheetah 18XL Product Manual, Rev. G
9.10
Disc drive SCSI timing
Table 18:
Disc drive SCSI timing
Description
Waveform
symbol [1]
Waveform
table [1]
Typical timing
Target Select Time (no Arbitration)
T00
N/A
<1 µs
Target Select Time (with Arbitration)
T01
4.5-1,2
1.93 µs
Target Select to Command
T02
4.5-1
3.77 µs
Target Select to MSG Out
T03
4.5-2
1.57 µs
Identify MSG to Command
T04
4.5-3
3.36 µs
Command to Status
T05
4.5-5
Command Dependent
Command to Data (para. In)
T06
4.5-9
Command Dependent
Command to Data (para. Out)
T07
4.5-10
Command Dependent
Command to Data (Write to Data Buffer)
T08
4.5-10
Command Dependent
Command to Disconnect MSG
T09
4.5-6
Command Dependent
Disconnect MSG to Bus Free
T10
4.5-6,14
0.52 µs
Disconnect to Arbitration (for Reselect)
This measures disconnected CMD overhead
T11
4.5-6
Command Dependent
Target win Arbitration (for Reselect)
T12
4.5-7
3.00 µs
Arbitration to Reselect
T13
4.5-7
1.60 µs
Reselect to Identify MSG In
T14
4.5-7
1.39 µs
Reselect Identify MSG to Status
T15
4.5-8
Command Dependent
Reselect Identify MSG to Data (media)
T16
4.5-11
Command Dependent
Data to Status
T17
4.5-15
Command Dependent
Status to Command Complete MSG
T18
4.5-5,8,15
0.98 µs
Command Complete MSG to Bus Free
T19
4.5-5,8,15
0.51 µs
Data to Save Data Pointer MSG
T20
4.5-14
4.00 µs
Save Data Pointer MSG to Disconnect MSG
T21
4.5-14
0.79 µs
Command Byte Transfer
T22
4.5-4
0.04 µs
Next Command Byte Access:
4.5-4
Next CDB Byte Access (Byte 2 of 6)
T23.6.2
4.5-4
0.58 µs
Next CDB Byte Access (Byte 3 of 6)
T23.6.3
4.5-4
0.12 µs
Next CDB Byte Access (Byte 4 of 6)
T23.6.4
4.5-4
0.12 µs
Next CDB Byte Access (Byte 5 of 6)
T23.6.5
4.5-4
0.12 µs
Next CDB Byte Access (Byte 6 of 6)
T23.6.6
4.5-4
0.12 µs
Next CDB Byte Access (Byte 2 of 10)
T23.10.2
4.5-4
0.59 µs
Next CDB Byte Access (Byte 3 of 10)
T23.10.3
4.5-4
0.11 µs ±1 µs
Next CDB Byte Access (Byte 4 of 10)
T23.10.4
4.5-4
0.12 µs ±1 µs
Next CDB Byte Access (Byte 5 of 10)
T23.10.5
4.5-4
0.11 µs ±1 µs
Next CDB Byte Access (Byte 6 of 10)
T23.10.6
4.5-4
0.11 µs ±1 µs
Next CDB Byte Access (Byte 7 of 10)
T23.10.7
4.5-4
0.13 µs ±1 µs
Next CDB Byte Access (Byte 8 of 10)
T23.10.8
4.5-4
0.12 µs ±1 µs
Next CDB Byte Access (Byte 9 of 10)
T23.10.9
4.5-4
0.12 µs ±1 µs
Next CDB Byte Access (Byte 10 of 10)
T23.10.10
4.5-4
0.12 µs ±1 µs
Cheetah 18XL Product Manual, Rev. G
Table 18:
71
Disc drive SCSI timing (Continued)
Description
Waveform
symbol [1]
Waveform
table [1]
Typical timing
Data In Byte Transfer (parameter)
T24
4.5-12
0.04 µs
Data Out Byte Transfer (parameter)
T25
4.5-13
0.04 µs
Next Data In Byte Access (parameter)
T26
4.5-12
0.12 µs
Next Data Out Byte Access (parameter)
T27
4.5-13
0.12 µs
Data In Byte Transfer (media) [2]
T28
4.5-12
0.04 µs
Data Out Byte Transfer (media) [2]
T29
4.5-13
0.04 µs
Next Data In Byte access (media [2]
T30
4.5-12
0.12 µs
Next Data Out Byte access (media [2]
T31
4.5-13
0.12 µs
MSG IN Byte Transfer
T32
4.5-5,7,8,14,15
0.04 µs
MSG OUT Byte Transfer
T33
4.5-2
0.04 µs
STATUS Byte Transfer
T34
4.5-5,8,15
0.04 µs
–
–
various (800 ns max)
Synchronous Data Transfer Characteristics:
Request Signal Transfer Period [3]
Notes.
[1]
[2]
[3]
See the SCSI Interface Product Manual, part number 75789509, Timing examples section.
Maximum SCSI asynchronous interface transfer rate is given in Section 4.2.3 of this manual.
Synchronous Transfer Period is determined by negotiations between an Initiator and a Drive. The Drive is
capable of setting periods as given in Section 9.5. See also the Synchronous data transfer section and the
Extended messages section of the SCSI Interface Product Manual, for a description of synchronous data
transfer operation.
9.11
Drive activity LED
The following table provides drive activity LED status.
Table 19:
Drive activity LED status
Spindle status
Command status
LED status
Spinning up with DC power applied
N/A
On until spinup is complete
Spun down
Start Unit
On while processing the command
Powered down by removal of DC power N/A
Off due to absence of power
Spun up
Stop Unit
On while processing the command
Spun down
No command activity
Off
Spun down
Write/Read Buffer
On while processing the command
Spun down
SCSI Bus Reset
On while processing the reset
Spun down
Test Unit Ready
On while processing the command
Spun up
No command activity
Off
Spun up
Write/Read
On while processing the command
Spun up
SCSI Bus Reset
On while processing the reset
Spun up
Test Unit Ready
On while processing the command
Spun up
Format with Immediate option on On while the command is initially processed
Spun up
Format without Immediate
LED toggles on/off on each cylinder boundary
72
Cheetah 18XL Product Manual, Rev. G
Cheetah 18XL Product Manual, Rev. G
10.0
73
Seagate Technology support services
Online Services
Internet
www.seagate.com for information about Seagate products and services. Worldwide support is available 24
hours daily by e-mail for your disc or tape questions.
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Tape: www.seagate.com/support/email/email_tape_presales.html or Tape_Sales_Support@Seagate.com.
Technical Support:
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Tape: www.seagate.com/support/email/email_tape_support.html or TapeSupport@Seagate.com.
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at marketplace.seagate.com, an exclusive service for US resellers participating in the Seagate Partner Program (SPP), is designed to streamline the purchasing process of Seagate solutions and provide unprecedented value to Seagate’s resellers through real-time pricing and availability, fast and easy comparison
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For support, questions and comments: reseller.seagate.com/benefits/T1.html or 1-877-271-3285 (toll-free)
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SeaFONE® (1-800-SEAGATE) is Seagate’s toll-free number (1-800-732-4283) to access our automated selfhelp services. Using a touch-tone phone, you can find answers to service phone numbers, commonly asked
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Our Presales Support staff can help you determine which Seagate products are best suited for your specific
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Technical Support
If you need help installing your drive, consult your dealer. Dealers are familiar with their unique system configurations and can help you with system conflicts and other technical issues. If you need additional help, you can
talk to a Seagate technical support specialist. Before calling, note your system configuration and drive model
number (ST####).
SeaTDD™ (+1-405-936-1687) is a telecommunications device for the deaf (TDD). You can send questions or
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74
Cheetah 18XL Product Manual, Rev. G
Customer Service (CSO)
Warranty Service
Seagate offers worldwide customer support for Seagate drives. Seagate direct OEM, Distribution and System
Integrator customers should contact their Seagate service center representative for warranty information.
Other customers should contact their place of purchase.
Authorized Service Centers
If you live outside the US, you can contact an Authorized Service Center for service.
USA/Canada/Latin America Support Services
Presales Support
Call Center
Disc:
Tape:
Toll-free
1-877-271-3285
1-800-626-6637
Direct dial
+405-936-1210
+1-714-641-2500
FAX
+1-405-936-1683
+1-714-641-2410
Technical Support (SeaFONE)
1-800-SEAGATE or +1-405-936-1234 (for specific product phone number)
FAX: Disc: +1-405-936-1685; Tape and Server Appliance: +1-405-936-1683
SeaFAX
SeaTDD
1-800-SEAGATE
+1-405-936-1687
Warranty Service
Call Center
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Mexico and Latin America
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—
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+1-405-936-1456
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+1-405-936-1462
+1-405-936-1464
1-800-636-6349
+1-905-660-4936
1-800-624-9857
+1-905-812-8099
+1-905-660-4951
www.memofix.com
+1-905-812-7807
www.adtech1.com
—
+55-21-509-7267
+55-21-507-6672
e-mail: sgt_cso@gbl.com.br
European Support Services
For European customer support, dial the toll-free number for your specific country for presales support, technical support and warranty service.
If your country is not listed here, dial our European call center at +31-20-316-7222 from 8:30 A.M. to 5:00 P.M.
(European central time) Monday through Friday. The European call center is located in Amsterdam, The Netherlands.
Call Center
Austria
Belgium
Denmark
France
Germany
Ireland
Italy
Netherlands
Norway
Poland
0 800-20 12 90
0 800-74 876
80 88 12 66
0 800-90 90 52
0 800-182 6831
1 800-55 21 22
800-790695
0 800-732 4283
800-113 91
00 800-311 12 38
*Authorized Service Centers
Cheetah 18XL Product Manual, Rev. G
Spain
Sweden
Switzerland
Turkey
United Kingdom
75
900-98 31 24
0 207 90 073
0 800-83 84 11
00 800-31 92 91 40
0 800-783 5177
Fax Services—All European Countries
Presales/Technical Support/Warranty Service
31-20-653-3513
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For presales, technical support, warranty service and FAX services in Africa and the Middle East, dial our
European call center at +31-20-316-7222 from 8:30 A.M. to 5:00 P.M. (European central time) Monday through
Friday, or send a FAX to +31-20-653-3513. The European call center is located in Amsterdam, The Netherlands.
Asia/Pacific Support Services
For Asia/Pacific presales and technical support, dial the toll-free number for your specific country. The Asia/
Pacific toll-free numbers are available from 6:00 A.M. to 10:45 A.M. and 12:00 P.M. to 6:00 P.M. (Australian eastern time) Monday through Friday. If your country is not listed here, direct dial one of our technical support locations.
Call Center
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—
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—
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0800-443988
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—
001-800-11-0032165
Direct dial
—
—
—
—
—
—
—
+65-488-7584
+886-2-2514-2237
—
FAX
—
+86-10-6871-4316
+852-2368 7173
—
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—
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+886-2-2715-2923
—
Toll-free
—
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—
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FAX
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—
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Warranty Service
Call Center
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76
Cheetah 18XL Product Manual, Rev. G
Cheetah 18XL Product Manual, Rev. G
Index
77
bytes/track 9
C
Symbols
+5 and +12 volt supplies 21
Numerics
68 conductor connector 59
68 pin connector 60
80 conductor connector 59
80 conductor interface 59
80 pin connector option 59
80 pin I/O connector 65, 66
A
AC power 21
access time 9
accessories 8
acoustics 31
activity indicator 67
activity LED 71
actuator 7, 42
actuator assembly 6
address 10
air circulation 42
air cleanliness 31
air flow 27, 42
suggested 42
air inlet 42
altitude 28
altitude and atmospheric pressure 27
ambient 28
ambient temperature 27, 42
ANSI SCSI documents 4
arbitration priority 60
asynchronous interface transfer rate 71
audible noise 3
Australia/New Zealand Standard 4
automatic retry 13
automatic shipping lock 5
average idle current 21
average latency 7
average rotational latency 9, 10
B
background processing 7
bits/inch 9
buffer 10, 11, 12
buffer segment 11, 12
buffer-full 11
buffer-full ratio 11
bulkhead connector 58
bus device reset message 50
bytes per sector 48
bytes/surface 9
cabinet cooling 42
cable 56
cache 10, 11, 12
cache buffer 7
cache miss 11
cache mode 10
cache operation 10
cache operation hit 12
cache segment 11
caching write data 11
Canadian Department of Communications 3
capacities 8
capacity, drive, programmable 8
case temperature 27
CE Marking 3
Certificate number 4
change definition command 46
changeable bit 50
changeable value 50
check condition 50
Chinese National Standard 4
circuits 68
class B limit 3
command 10, 46
command descriptor block (CDB) 10
command queuing 7
condensation 27, 28
conducted noise immunity 21, 22
connect/disconnect 10
connector 56
connector contact 67
consecutive read operation 12
contiguous blocks of data 12
continuous vibration 31
controller 10
controller overhead 9
controller self test 22
cooling 42
C-Tick Marking 3
current 22
current limiting 22
current profile 22, 23, 24
current requirements 21
current value 50
cylinder boundary 12
D
daisy-chain 22, 58, 60
80 conductor 59
data correction 13
data transfer period 56
data transfer protocol 7
data transfer rate 9
DC cable and connector 56
78
DC current 58
DC power 10, 13, 41, 56
DC power carrying conductor 59
DC power connector 56
DC power requirements 21
DC power source 59
dedicated landing zone 5
default 40, 41
default mode parameter 37
default value 50
defect/error management 35
delayed motor start option 21, 67
delayed start 41
depot repair 15
depot repair philosophy 15
diagnostics 22
differential I/O circuit 41
differentiating features 5
dimensions 32
disable read ahead 12
disc access 11
disc media 9
disc rotational speed 9
disconnect/reconnect 11
control 11
specification 11
discontinuity (DISC) bit 12
DRA bit 12
drive 31
drive activity 67
drive activity LED 71
drive capacity 9
programmable 8
drive default mode parameter 37
drive failure 14
drive firmware 50
drive ID 37
drive ID select jumper connector 37
drive ID/option select header 37
drive interface connector 59
drive internal 22
drive internal defects and errors 35
drive malfunction 14
drive mounting 32, 43
constraints 13
drive orientation 42
drive power 37
drive primary defects list 35
drive SCSI timing 70
drive select header 56
drive spindle 41
drive transfer 11
drive volume 37
drive warranty 15
dynamic spindle brake 7
Cheetah 18XL Product Manual, Rev. G
E
ECC 13
ECC correction capability 7
electrical characteristics 56, 67
electromagnetic compatibility 3
electromagnetic interference (EMI) 13
electromagnetic susceptibility 31
embedded servo 7
EMC compliance 3
EMI requirements 3
environment 42
environmental control 31
environmental interference 13
environmental limits 27
environmental requirements 13
EPROM 50
equipment malfunction 13
error 13
error management system 36
error rate 13
error rate calculation 13
error recovery 35
ETF defect list 35
European Union requirements 3
EVPD bit 49
execution time 10
extended messages 46
F
fault status 13
FCC rules and regulations 3
field repair 15
firmware 50
flat ribbon cable 67
flaw reallocation 10
format 48
format command 9
format time 10
formatted 8
formatting 37
front panel 32
front panel LED 67
FSW function 51, 53
G
GMR heads 5
gradient 28
ground return 21
grounding 43
H
hard reset 50
hardware error 14
HDA 5, 15, 27, 42, 43
temperature 27
Cheetah 18XL Product Manual, Rev. G
head and disc assembly. See HDA
heat removal 42
heat source 42
high level format 37
host 12, 35, 41, 48, 58, 60
host adapter 37
adapter/initiator 60
host backplane wiring 58
host equipment 43, 59
DC power 59
host I/O signal 37
host system 37
host system malfunction 13
host/drive operational interface 13
hot plug 7, 15
humidity 27, 28
I
I/O connector 58
identified defect 35
idle condition 25, 26
Input characteristics 68
inquiry command 49
inquiry vital product data 49
installation 37
installation guide 4, 8
installation instructions 37
instantaneous current peak 21
integrated Ultra1/Ultra2 SCSI controller 7
interface cable length 60
interface data 9
interface requirements 45
interface timing 13
interleave 7
internal data rate 9
J
J1-auxiliary 37
jumper 8, 37, 40, 41, 67
jumper function description 41
jumper header 40
jumper plug type 37
K
Korean Ministry of Information and Communication 4
L
landing zone 7
LB 11
LED 71
logical 10
logical block 10, 11, 12
logical characteristics 56
logical segment (mode select page 08h) 10
low level format 37
low voltage differential (LVD) drivers and receivers 7
79
LVD 67, 68
LVD interface receiver circuits 68
LVD output signals 68
M
magnetoresistive heads 5
mating connector 56, 59
mating flat cable connector 59
maximum current requirements 22
maximum operating current 21
maximum starting current 21
ME jumper 41
mean time between failure. See MTBF
media 7, 50
media defect 13
media defect induced error 13
medium error 14
message protocol 56
message protocol system 36
messages
SCSI interface 45
Ministry of Information and Communication Republic
of Korea 4
miscellaneous features 55
mode page 01 50
mode page 08h 10
mode parameter 50
page 08h 12
mode select command 10, 11, 50
mode select page 08h 12
mode sense command 50
mode sense command page 08h 11
mode sense data 50
mode sense value 50
model number table 5
motor start command 10
motor start delay option 67
motor start option 10, 21, 67
mounting configuration 32
mounting configuration dimensions 32, 33
mounting constraints 13, 43
mounting point 43
mounting surface 43
mounting surface distortion 43
mounting surface stiffness 43
MTBF 13, 14, 27
multimode drivers and receivers 7
multiple segment 11
multi-segmented cache control 10
N
noise 22
audible 3
non-operating 28, 29, 31
temperature 28
non-operating vibration 31
nonshielded 68 conductor connector 59
80
O
office environment 31
operating 28, 29, 31
operating environment 14
operating option 37
operating parameter 50
operator intervention 13
option jumper 37
option jumper location 37
option select header 56
option select jumper 37
options 8
orientation 10, 29, 42
out-of-plane deflection 43
out-of-plane distortion 43
Output characteristics 67
P
package size 29
package test specification 4
packaged 29
parity 41
parity checking 41
parity error 41
partition or logical drive 37
PCB 15, 40, 42
temperature 27
PCBA 37, 43, 50, 56, 58, 60
PCBA circuit run 58
PD jumper 41
peak bits/inch 9
peak starting current 21
performance characteristics 9
performance degradation 29
peripheral I/O cable 22
physical buffer space 10
physical characteristics 56
physical damage 31
physical interface 56, 57
physically contiguous blocks of data 12
power 21, 22, 41
power connector 21, 22
power control switch 10
power dissipation 25, 26
power distribution 3
power sequencing 22
power supply voltage 13
power-carrying conductor 59
power-on 37, 67
power-on operating hours 14
power-on reset 50
power-up 22, 41
power-up hours 14
prefetch 10, 11, 12
prefetch (read look-ahead) 10, 12
prefetch ceiling field 12
Cheetah 18XL Product Manual, Rev. G
prefetch data 12
prefetch field 12
prefetch hit 12
prefetch mode 10
prefetch of contiguous blocks 12
prefetch operation 10, 12
prefetch segmented cache control 10
preventive maintenance 13, 15
printed circuit board. See PCB
PRML read channel electronics 5
product data page 49
programmable drive capacity 8
R
radio interference regulations 3
Radio Research Laboratory 4
read 10
read command 10, 11, 12
read data 11
read error 13
read error rate 13, 35
read operation 11
read retry count 35
read/write head 9
ready 50
receive diagnostic results 36
receiver circuits 68
recommended mounting 30
recoverable seek error 13
reference documents 4
regulation 21
relative humidity 28
reliability 7
reliability and service 14
reliability specifications 13
remote switch 37
repair facility 15
repair information 19
REQ/ACK offset 56
request sense command 36
request sense information 14
resonance 29
retrieved data 11
S
S.M.A.R.T. 7, 16
safe power transmission 59
safety 3
Safety and Regulatory Agency Specifications 4, 8
saved value 50
SCSI
commands 46
format commands 13
interface data transfer rate 9
messages 45
SCSI bus cable 37
SCSI bus condition 55
Cheetah 18XL Product Manual, Rev. G
SCSI bus ID 67
SCSI bus phase sequence 55
SCSI command 35
SCSI I/O connector 57
SCSI ID 37, 41
SCSI interface 10, 13, 58
SCSI interface cable 58
SCSI interface commands supported 46
SCSI interface connector 56
SCSI interface data 9
SCSI Interface Product Manual 1, 3, 4, 5
SCSI systems error 36
SCSI systems error consideration 35
SCSI systems error management 36
SCSI Ultra160 implementation 50
SE 67
Seagate support service 37
sector 11
sector interleave 9
sector size 8
sector sizes 10
seek error 13
seek positioning error 13
segment 10, 11
segment number 11
self-contained 11
Self-Monitoring Analysis and Reporting Technology.
See S.M.A.R.T.
SE-LVD alternative 68
sense key 14
sequential read operations 12
service
life 13, 15
philosophy 15
tools 15
servo data 5
shielding 3
shipping 19
shipping container 28
shock 29
and vibration 29
shock mount 43
signal ground 43
single unit shipping pack 8
single-ended (SE) drivers and receivers 7
single-ended interface circuit 25, 26
site installation 15
software interleave 12
spare part 15
spindle 22
spindle startup 41
standard day 27
standards 3
start motor command 21
start unit command 41
start/stop time 10
status 36
stop spindle 10
81
stop time 10
storage capacity 35
straight-in connector 60
strict bit in Mode page 00h 11
supply voltage 21
support services 73
synchronous data transfer 56
synchronous data transfer operation 71
synchronous data transfer period 56
synchronous transfer period 71
system chassis 43
system recovery procedures 13
T
Taiwanese Bureau of Standards, Metrology, and Inspection 4
technical support services 73
temperature 10, 27, 42
ambient 27
case 27
gradient 27
non-operating 28
PCB and HDA 27
regulation 3
See also cooling
termination 22
terminator enable jumper TE 60
terminator power 69
terminator requirements 37, 69
TP1 position 41
tracks/inch 9
tracks/surface, total 9
transfer period 56
transmitter receiver circuits 68
typical access time 10
U
Ultra160 mode 46
Ultra160 SCSI 5
Ultra160 SCSI controller 7
Ultra160 SCSI interface 5, 7
unformatted 8
unrecoverable condition 13
unrecoverable error 13
unrecoverable seek error 14
Unrecoverable write error 13
V
vibration 29, 31
vital product data 49
volatile memory 50
voltage 10, 21
W
warranty 7, 19
wet bulb temperature 27
82
wide Ultra160 SCSI interface 5
WP jumper 41
wrap-around 11
write caching 11
write error 13
unrecoverable 13
write operation 11
write protect 41
write retry count 35
Z
zoned bit recording (ZBR) 7
Cheetah 18XL Product Manual, Rev. G
Seagate Technology LLC
920 Disc Drive, Scotts Valley, California 95066-4544, USA
Publication Number: 75789506, Rev. G, Printed in USA