Fujitsu MJA2500BH Maintenance Manual - Page 36
Recommended power-off sequence, 1.11 Advanced Power Management (APM) - hdd
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Device Overview When the power is shut down, the controlled Unload cannot be executed. Therefore, the number of Emergency other than Unload is specified. 1.10.1 Recommended power-off sequence We recommend cutting the power supply of the HDD for this device after the Head Unload operation completes. The recommended power supply cutting sequence for this device is as follows: 1) Disk Flush Flush Cache command execution. 2) Head Unload Standby Immediate command execution. 3) Wait Status Checking whether bit 7 of the status register was set to '0'. (wait to complete STANDBY IMMEDIATE command) 4) HDD power supply cutting 1.11 Advanced Power Management (APM) The disk drive automatically shifts to the power saving mode according to the setting of the APM mode under the idle condition. The APM mode can be chosen with a Sector Count register of the SET FEATURES (EF) command. The disk drive complies with the three kinds of APM modes that a command from the host is required. FR = 05h : Enable APM SC = C0h - FEh : Mode-0 Active Idle → Low Power Idle SC = 80h - BFh : Mode-1 Active Idle → Low Power Idle (Default) SC = 01h - 7Fh : Mode-2 Active Idle → Low Power Idle → Standby FR = 85h : Disable APM (Set Mode-0) 1-14 C141-E293