Power Save; Power Save Mode - Fujitsu MHN2100AT - Mobile 10 GB Hard Drive Product Manual

6.2 Power Save

The host can change the power consumption state of the device by issuing a
power command to the device.

6.2.1 Power save mode

There are four types of power consumption state of the device including active
mode where all circuits are active.
In the power save mode, power supplying to the part of the circuit is turned off.
There are three types of power save modes:
Idle mode
Standby mode
Sleep mode
Regardless of whether the power down is enabled, the device enters the idle mode
by itself. The device also enters the idle mode in the same way after power-on
sequence is completed.
(1) Active mode
In this mode, all the electric circuit in the device are active or the device is under
seek, read or write operation.
A device enters the active mode under the following conditions:
A command other than power commands is issued.
A reset command is received.
(2) Idle mode
In this mode, circuits on the device is set to power save mode.
The device enters the Idle mode under the following conditions:
After completion of power-on sequence.
After completion of the command execution other than SLEEP and STANDBY
commands.
After completion of the reset sequence
(3) Standby mode
In this mode, the VCM circuit is turned off and the spindle motor is stopped.
The device can receive commands through the interface. However if a command
with disk access is issued, response time to the command under the standby mode
C141-E120-02EN
6.2 Power Save
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