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4.4.7.1 Power mode
The ODD supports power modes shown below. The ODD uses a power mode equivalent to
standby mode, except that the DRDY bit is 0 while media is not mounted.
! Active mode
! Pre-idle mode
! Idle mode
! Standby mode
! Sleep mode
4.4.7.2 Active mode
In active mode, all circuits are enabled. The ODD requires the shortest time to start processing a
command.
4.4.7.3 Pre-idle mode
In pre-idle mode, the read/write circuits stop. The ODD can receive a command from the host, but
since some circuits stop, the command requires 20 ms to access media.
The ODD automatically enters pre-idle mode if no command is issued within a specified time (0.5
second) in active mode. When it receives an access command, the ODD automatically enters
active mode. The pre-idle mode cannot be controlled from the host computer.
4.4.7.4 Idle mode
In idle mode, the servo and read/write circuits stop. The ODD can receive a command from the
host, but because some circuits stop, the ODD takes 1.0 seconds (standard) to access media.
If no command is issued within a specified time (180 seconds) in active mode, the ODD
automatically enters pre-idle mode, then enters idle mode. When it receives an access command,
the ODD automatically returns active mode. The Idle Immediate command can shift the ODD
from active mode or standby mode to idle mode.
4.4.7.5 Standby mode
In standby mode, the spindle mode stops. The ODD can receive a command from the host, but
since the spindle motor stops, the recovery to access media takes 5 seconds (standard).
The ODD automatically enters standby mode from active mode if no command is issued within a
specified time when the standby timer is enabled. When it receives a command, the ODD
automatically returns active mode. The Standby Immediate command can also directly shift the
ODD from active or idle mode to standby mode.