Advanced Power Management - Fujitsu MHS2030AT - 2.5" Notebook 30GB Drive Product Manual

Device Overview
Emergency Unload other than Normal Unload is performed when the power is
shut down while the heads are still loaded on the disk.
The product supports the Emergency Unload a minimum of 20,000 times.
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:
This device is recommended to cut the power supply of HDD after head Unload
operates. We will inform of the power supply cutting sequence which this device
recommends as follows.
1) Disk Flush
Flush Cache command execution.
2) Head Unload
Standby Immediate command execution.
3) Wait Status
Please wait to complete the command by Status Register.
4) HDD power supply cutting

1.11Advanced 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
SETFEATURES(EF) command.
The default mode of APM shifts to Low power idle(Mode-1).
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 :
SC = 80h - BFh :
SC = 01h - 7Fh :
FR = 85h : Reset APM (return to Default.)
1-12
Mode-0 Active Idle
Mode-1 Low power Idle (Default)
Mode-2 Standby
C141-E171-03EN