Fujitsu MHY2060BS, MHY2160BS, MHY2200BS, MHY2120BS, MHY2040BS manual Advanced Power Management APM

5.3 Host Commands

*2) Advanced Power Management (APM)

The host writes the Sector Count field with the desired power management level and executes this command with the Features field X '05', and then Advanced Power Management is enabled.

The drive automatically shifts to power saving mode up to the specified APM level when the drive does not receive any commands for a specific time. The sequence in which the power management level shifts is from Active Idle to Low Power Idle.

The Mode-2 level requires the longest shifting time, depending on the APM level settings. The settings of the APM level revert to their default values (Mode-1) when power-on or COMRESET occurs for the drive.

APM Level		Sector Count Field
Mode 0 Active Idle → Low Power Idle		C0h-FEh
Mode 1 Active Idle → Low Power Idle		80h-BFh
Mode 2 Active Idle → Low Power Idle		01h-7Fh
Reserve (State Keep)		00h, FFh
Active Idle:	The spindle motor rotates, and the head is loaded on
	the most inner position on media.

Low Power Idle: The spindle motor rotates, and the head is unloaded.

Standby: The spindle motor stops, and the head is unloaded.

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