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C141-E056-02EN 6 - 9
(1) Active mode
In this mode, all the electric circuit in the device are active and seek, read, or write operation is
possible.
A device enters the active mode under the following conditions:
• Power-on sequence is completed.
• A command with accessing the medium is issued in Idle mode or Standby mode. And in
case that the following command with accessing the host is issued when the device is in
Active mode, the device is stayed in the active mode after processing.
• Reset
• A power command other than CHECK POWER MODE command is issued.
(2) Idle mode
In this mode, the VCM circuit is turned off. Although the device interface can receive a
command in case of accessing the drive, it will take much more time than that in the active
mode because it can not access the drive directly at once.
The device enters the Idle mode under the following conditions.
• IDLE command or IDLE IMMEDIATE command is issued in the active mode or Standby
mode. And in case that the following command with accessing the host is issued when
the device is in Idle mode, the device is still stayed in the Idle mode after processing.
• Reset
• IDLE command or IDLE IMMEDIATE command
• A command without accessing the medium
(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 takes longer than the
active or Idle mode because the access to the disk medium cannot be made immediately.
The drive enters the standby mode under the following conditions:
• A STANDBY or STANDBY IMMEDIATE command is issued in the active or idle mode.
• When automatic power down sequence is enabled, the timer has elapsed.
• A reset is issued in the sleep mode.