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11.8.27.3 Stand-by (E2/96)
This command causes the device to enter stand-by mode.
If SC is non-zero then stand-by timer shall be enabled. The value in SC shall be used to determine the time
programmed into the stand-by timer.
If SC is zero then the stand-by timer is disabled.
Value in SC register Setting
0 Time out disabled
1-240 (SC x 5) sec.
241-251 ((value - 240) x 30) min.
252 21 min
253 Period between 8 and 12 hrs
254 Reserved
255 21 min 15 sec.
When the specified time period has passed, the drive enters stand-by mode. If a disk access command is
received during stand-by mode, the spindle starts rotating and the drive executes read/write operation.
After completing the command, the drive reset stand-by timer and the timer starts counting down.
11.8.27.4 Idle (E3/97)
This command causes the device to enter idle mode.
If SC is non-zero then stand-by timer shall be enabled. The value in SC shall be used to determine the time
programmed into the stand-by timer.
If SC is zero then the stand-by timer is disabled.
Value in SC register Setting
0 Time out disabled
1-240 (SC x 5) sec.
241-251 ((value - 240) x 30) min.
252 21 min
253 Period between 8 and 12 hrs
254 Reserved
255 21 min 15 sec.
When the specified time period has expired, the drive enters the stand-by mode. If disk access command
is received during the stand-by mode, the spindle starts rotating and executes read/write operation. After
completing the command, The drive resets stand-by timer and the timer starts counting down.
11.8.27.5 Check Power Mode (E5/98)
SC result value=00 indicates that the drive is in stand-by mode or going into stand-by mode or is shifting
from stand-by mode into idle mode.
SC result value=FFH indicates that the drive is in idle mode.
11.8.27.6 Sleep (E6/99)
When SC=X, the drive enters sleep mode immediately. After entering the sleep mode, the drive issues an
interrupt to report the host that the command has been completed. The drive recovers from sleep mode and
enters stand-by mode by receiving a reset.