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Device Overview
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
(VCM Lock)
Low Power Idle
(Unload)
Standby
(Spin Off)
Mode-0 3-4 sec 15 min. N/A
Mode-1 3-4 sec 10-40 sec N/A
Mode-2 3-4 sec 10-40 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 3-4, and to Low
Power Idle in 15 minutes.
Mode-1: Mode shifts from Active condition to Active Idle in 3-4 seconds and to
Low Power Idle in 10-40 seconds.
Mode-2: Mode shifts from Active condition to Active Idle in 3-4 seconds and to
Low Power Idle in 10-40 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) 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.
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