Fujitsu MCF3064AP, MCE3064AP, MCE3130AP manual MO write cache

When the cache is enabled, the buffer contains data transferred from the host with a write command. If a read command is issued to the sector address at this time, the ODD directly transfers data to the high-level equipment from the data buffer 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 once transferred to the host during prereading

!Data read before hardware reset, software reset, DEVICE RESET command is received, or power-off

!Data already stored before media is mounted

All buffer data is discarded under the following conditions:

!Hardware reset, software reset, DEVICE RESET command is received, or power-off

!When media is ejected

!When the FORMAT UNIT command is received

!In standby mode

!In sleep mode

!When the system receives a command (such as MODE SELECT and SET FEATURES) that may change the operating mode

4.4.5.3MO 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 (10), WRITE (12), or WRITE AND VERIFY command (hereafter "Write command" in this document). If Write commands are continuously issued, the ODD responds to the host with command end when the data transfer is completed. This occurs if the specified sector is continuous from the sector specified by the previous command.

The ODD writes data kept in the buffer to media under the following conditions:

!When data can be written on media during data transfer with a Write command or while the ODD is waiting for a command

!When a command that requires a new segment is received while all segments in the data buffer are used

!When the Eject switch is pressed

!When the SYNCHRONIZE CACHE command is received/DEVICE RESET command is received

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