Fujitsu MCJ3230SS manual Power management function, Power mode, MO write cache

Host Interface

•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.

4.2.4.3MO 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).

4.2.5Power 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

4-6 C156-E224-01EN