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1.11 Advanced Power Management
C141-E221 1-13
Active Idle: The head is in a position of extreme inner in disk
medium.
Low Power Idle: The head is unloaded from disk.
The spindle motor rotates.
Standby: The spindle motor stops.
Table 1.7 Advanced Power Management
APM Mode Active Idle
Low Power Idle
(Unload)
Standby
(Spin Off)
Mode-0 3.0 - 4.0 sec 900.0 sec N/A
Mode-1 3.0 - 4.0 sec 10.0 - 40.0 sec N/A
Mode-2 3.0 - 4.0 sec 10.0 - 40.0 sec N/A
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 3.0 - 4.0 seconds
and to Low Power Idle in 900.0 seconds.
Mode-1: Mode shifts from Active condition to Active Idle in 3.0 - 4.0 seconds
and to Low Power Idle in 10.0 - 40.0 seconds.
Mode-2: Mode shifts from Active condition to Active Idle in 3.0 - 4.0 seconds
and to Low Power Idle in 10.0 - 40.0 seconds.
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) by hardware reset and at power-off.