Fujitsu MJA2500BH Maintenance Manual - Page 197
Low Power Idle, Mode 2 Active Idle
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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 to Standby. 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 Mode 0 Active Idle → Low Power Idle Mode 1 Active Idle → Low Power Idle Mode 2 Active Idle → Low Power Idle → Standby Reserve (State Keep) Sector Count Field C0h-FEh 80h-BFh 01h-7Fh 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. C141-E293 5-123