6.2 Power Save
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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:
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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.
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Reset (hardware or software)
STANDBY command
STANDBY IMMEDIATE command
INITIALIZE DEVICE PARAMETERS command
CHECK POWER MODE command
(5) Sleep mode
Sleep mode is the minimal of power consumption. The only method that returns from Sleep mode is to execute Software Reset (SRST) or COMRESET. The device enters to Standby mode after it returns from Sleep mode.
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.)