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Host Interface
4-6 C156-E224-01EN
• Data read before power-off
• Data stored before media is mounted
All buffer data is discarded when:
• The power is turned off.
• The media is ejected.
• A FORMAT UNIT command is received.
• The ODD is in standby mode.
Buffer data may be discarded when:
• A MODE SELECT command that changes the read conditions is received.
4.2.4.3 MO write cache
If the write cache is enabled, the ODD responds to the host with command
completion when data transfer for a WRITE or WRITE AND VERIFY command
(hereafter collectively called a write command) is completed.
The ODD writes data stored in the buffer to the media and proceeds to the next
processing when:
• The eject switch is pressed.
• A SYNCHRONIZE CACHE command is received.
When data is contained in the buffer, and if any of the following conditions
occurs, the data in the buffer may not be written to the media correctly:
• The power is turned off.
• The media is forcibly ejected (mechanical ejection).
4.2.5 Power management function
The ODD provides a power management function that minimizes power
consumption. A timer is used to implement the function.
4.2.6 Power mode
The ODD supports the power modes listed below. If no media is mounted, the
ODD uses a power mode equivalent to standby mode.
• Active mode
• Pre-idle mode
• Idle mode
• Standby mode