Performance characteristics. Seagate ST173404FC

Cheetah 73FC Product Manual, Rev. C 9

4.0

Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of

Cheetah 73FC drives.

4.1

Internal drive characteristics

Drive capacity

Read/write data heads

Bytes per track

Bytes per surface

Tracks per surface

Tracks per inch

Peak bits per inch

Internal data rate

Disc rotation speed

Avg rotational latency

ST173404FC

73.4 .......................... Gbytes (formatted, rounded off value)

24

215-248 .................... KBytes (average, rounded off values)

3,035 ........................ Mbytes (unformatted, rounded off value)

14,100 ...................... Tracks (user accessible)

18,145 ...................... TPI

334 ........................... kBPI

280-427 .................... Mbits/sec (variable with zone)

10,025 ...................... rpm (+ 0.5%)

2.99 .......................... msec

4.2

Seek performance characteristics

4.2.1

Access time

Including controller overhead (without disconnect)

1

,

2

(msec)

Not including controller overhead

(without disconnect)

1,2

(msec)

Average

Single track

Full stroke

Typical

3

,

4

Typical 3,4

Typical 3,4

Read

6.05

0.8

14.2

Write

6.55

1.1

15.2

Read

5.85

0.6

14.0

Write

6.35

0.9

15.0

1.

Execution time measured from receipt of the command to the FCP Response.

2.

Assumes no errors and no sector has been relocated.

3.

Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives.

4.

Access time = controller overhead + average seek time.

Access to data = controller overhead + average seek time + latency time.

4.2.2

Format command execution time for

≥

512-byte sectors

Maximum (with verify)

Maximum (without verify)

ST173404FC

240 minutes

120 minutes