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Host Interface
4-16 C156-E205-01EN
without reading it from media. If the cache is hit with a read command, the ODD
makes the data in the hit segment being kept in the highest priority.
The data listed below cannot be stored in the read cache.
!
Data read before power-off
!
Data already stored before media is mounted
All buffer data is discarded under the following conditions:
!
Power-off
!
When media is ejected
!
When the FORMAT UNIT command is received
!
In standby mode
!
In sleep mode
Buffer data my be discarded under the following condition:
!
When the system receives the MODE SELECT and SET FEATURES
command that may change the reading mode
4.4.5.3 MO write cache
When the write cache is enabled, the ODD responds to the host with command
end. This occurs when the data transfer is done with the WRITE command or
WRITE AND VERIFY command (hereafter "Write command" in this document).
The ODD writes data kept in the buffer to media under the following conditions:
!
When the Eject switch is pressed
!
When the SYNCHRONIZE CACHE command is received
!
When the FLUSH CACHE command is received
Under the conditions given below, write data in the buffer may not be written
properly on media:
!
Power-off
!
Forced media ejection (mechanical ejection)
4.4.6 Media status notification function
The media status notification function notifies the host of various information on
the removable media device. The function is enabled or disabled with the SET
FEATURES command.
When the media status notification function is enabled, the functions below will be
added or changed.