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Host Interface
4-18 C156-E205-01EN
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 s
seconds (standard) to access 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. 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 motor stops. The ODD can receive a command from
the host, but since the spindle motor stops, the recovery to access media takes 5 s
(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.
4.4.7.6 Sleep mode
Sleep mode uses power consumption as standby mode. To set the ODD in sleep
mode, the host must issue the Sleep command. To restore the ODD from sleep
mode, hardware reset or software reset is required. The host must not issue any
command after the Sleep command. The ODD requires 15 s (standard) to respond.
4.4.7.7 Standby timer
The standby timer is used to count the time during which the host issues no
command.
The standby timer value is programmable with the Power Condition Page of the
MODE SELECT command. The default value is 32 minutes (including the
transition time to idle mode).