Device Overview

Active Idle:

The head is in a position of extreme inner in disk

 

medium. (VCM Lock)

Low Power Idle:

The head is unloaded from disk.

 

The spindle motor rotates.

Standby:

The spindle motor stops.

In APM Mode-1, which is the APM default mode, the operation status shifts till it finally reaches "Low Power Idle."

Table 1.7 Advanced Power Management

APM Mode

Active Idle

Low Power Idle

Standby

(VCM Lock)

(Unload)

(Spin Off)

 

 

 

 

 

Mode-0

0.2-1.2 sec

15 min.

N/A

 

 

 

 

Mode-1

0.1-0.2 sec

10.0-27.5 sec

N/A

 

 

 

 

Mode-2

0.1-0.2 sec

10.0-27.5 sec

10.0-40.0 sec

 

 

 

 

When the maximum time that the HDD is waiting for commands has been exceeded:

Mode-0: Mode shifts from Active condition to Active Idle in 0.2-1.2, and to Low Power Idle in 15 minutes.

Mode-1: Mode shifts from Active condition to Active Idle in 0.1-0.2 seconds and to Low Power Idle in 10.0-27.5 seconds.

Mode-2: Mode shifts from Active condition to Active Idle in 0.1-0.2 seconds and to Low Power Idle in 10.0-27.5 seconds. After 10.0-40.0 seconds in Low Power Idle, the mode shifts to standby.

Remark:

The default values of these settings are reflected in the WORD 91 values of the IDENTIFY DEVICE command. Also, the APM mode is initialized to Mode-1 (default value) at power-off.

The above mentioned is time until shifting to each power mode based on point that the drive becomes a command waiting state.

1-16

C141-E280