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4.2 Various Processes
C156-E224-01EN 4-7
4.2.6.1 Active mode
In active mode, all circuits are enabled and the time for command processing is
minimized.
4.2.6.2 Pre-idle mode
In pre-idle mode, the read and write circuits are in stopped state. The ODD can
receive a command from the host, but since some circuits are stopped, the
command requires an additional 20 ms to access the media.
The ODD automatically enters pre-idle mode if no command is issued within a
specified time (0.5 s) in active mode. The ODD automatically enters active mode
when it receives a media access command.
4.2.6.3 Idle mode
In idle mode, the servo, and read and write circuits are in stopped state. The ODD
can receive a command from the host, but since some circuits are stopped, the
command requires an additional 1 s (default) to access the media.
If no command is issued within a specified time (180 s) in active mode, the ODD
automatically enters pre-idle mode, then enters idle mode. The ODD
automatically enters active mode when it receives a media access command.
4.2.6.4 Standby mode
In standby mode, the spindle motor stays stopped. The ODD can receive a
command from the host, but since the spindle motor is stopped, the command
requires 5 s (default) for recovery before accessing the media.
If no command is issued within a specified time while the ODD is in active mode
with the standby timer enabled, the ODD automatically enters standby mode. The
ODD automatically enters active mode when it receives an access command.
4.2.6.5 Standby timer
The standby timer counts the elapsed time during which the host issues no
commands.
The standby timer value is programmable with the Power Condition Page of the
MODE SELECT command. The default standby timer value is 32 minutes
(including the transition time to idle mode).