User manual

Hitachi hard disk drive specifications

6.4.7 Required Power-Off Sequence

The required BIOS sequence for removing power from the drive is as follows:

Step 1: Issue one of the following commands.

Standby

Standby immediate

Sleep

Note: Do not use the Flush Cache command for the power off sequence because this command does not

invoke Unload

Step 2: Wait until the Command Complete status is returned. In a typical case 350 ms are required for the

command to finish completion; however, the BIOS time out value needs to be 30 seconds considering error

recovery time.

Step 3: Terminate power to HDD.