Fujitsu MHT2030AT Manual/User Guide - Page 32
Advanced Power Management - hdd
UPC - 683728090579
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Device Overview When the power is shut down, the controlled Normal Unload cannot be executed. Therefore, the number of Emergency other than Normal Unload is specified. Remark: 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 The disk drive shifts to the three kinds of APM modes automatically under the Idle condition. The APM mode can be chosen with a Sector Count register of the SET FEATURES(EF) command. In APM Mode-1, which is the APM default mode, the operation status shifts till it finally reaches "Low Power Idle." 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) 1-12 C141-E192-02EN