6.3 Power Save. Fujitsu C141-E090-02EN

Add to My manuals
189 Pages

advertisement

6.3 Power Save. Fujitsu C141-E090-02EN | Manualzz

(2) LBA mode

Logical address assignment in the LBA mode starts from physical cylinder 0, physical head 0, and physical sector 1. The logical address is advanced at the subsequent sector from the last sector of the current track. The first physical sector of the subsequent physical track is the consecutive logical sector from the last sector of the current physical track.

Figure 6.6 shows an example of (assuming there is no track skew).

Physical cylinder 0

Physical head 0

Physical sector

1 2 3

LBA

0

LBA

1

LBA

2

. . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . .

503 504

LBA

503

LBA

504

505

SP

506

SP

Physical cylinder 0

Physical head 1

1 2 3

LBA

504

LBA

505

LBA

506

. . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . .

503 504

LBA

1006

LBA

1007

505

SP

506

SP ex: Zone 0

Physical parameter

- Physical sector: 1 to 504 (For the rest, 2 spare sectors)

Figure 6.6

Address translation (example in LBA mode)

6.3

Power Save

The host can change the power consumption state of the device by issuing a power command to the device.

6.3.1

Power save mode

There are four types of power consumption state of the device including active mode where all circuits are active.

In the power save mode, power supplying to the part of the circuit is turned off. There are three types of power save modes:

Idle mode

Standby mode

Sleep mode

6 - 8 C141-E090-02EN

(1) Active mode

In this mode, all the electric circuit in the device are active or the device is under seek, read or write operation.

A device enters the active mode under the following conditions:

A command with Seek or Write or Read is issued.

(2) Idle mode

In this mode, circuits on the device is set to power save mode.

The device enters the Idle mode under the following conditions:

A IDLE or IDLE IMMEDIATE command is issued in the active or standby mode.

When one of following command is issued, the command is executed narmally and the device is still in the idle mode.

- Reset (hardware or software)

- IDLE command

- IDLE IMMEDIATE command

- A command with out Seek or Write or Read is issued.

(3) Standby mode

In this mode, the VCM circuit is turned off and the spindle motor is stopped.

The device can receive commands through the interface. However if a command with disk access is issued, response time to the command under the standby mode takes longer than the active or Idle mode because the access to the disk medium cannot be made immediately.

The drive enters the standby mode under the following conditions:

A STANDBY or STANDBY IMMEDIATE command is issued in the active or idle mode.

When automatic power down sequence is enabled, the timer has elapsed.

A reset is issued in the sleep mode.

When one of following commands is issued, the command is executed normally and the device is still stayed in the standby mode.

Reset (hardware or software)

STANDBY command

STANDBY IMMEDIATE command

INITIALIZE DEVICE PARAMETERS command

C141-E090-02EN 6 - 9

advertisement

Related manuals

Download PDF

advertisement

Table of contents