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6.2 Power Save
C141-E262 6-9
• Upon receipt of a COMRESET
• Upon receipt of Idle/Idle Intermediate
(4) Standby mode
In this mode, the spindle motor has stopped from the low power idle state.
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, active idle, or low power 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.
• A certain amount of time has elapsed in the low power idle state.
(APM Mode 2)
• The time specified by the STANDBY or IDLE command has elapsed after
completion of the command.
• A reset is issued in the sleep mode.
When one of following commands is issued, the command is executed normally
and the device is still stayed in the standby mode.
• Reset (hardware or software)
• STANDBY command
• STANDBY IMMEDIATE command
• INITIALIZE DEVICE PARAMETERS command
• CHECK POWER MODE command
(5) Sleep mode
The power consumption of the drive is minimal in this mode. The drive enters
only the standby mode from the sleep mode. The only method to return from the
standby mode is to execute a software or COMRESET.
The drive enters the sleep mode under the following condition:
• A SLEEP command is issued.
In this mode, the device does not accept the command. (It is ignored.)