Datasheet

3.3 Write Cache
C141-C008 3-13
3.3 Write Cache
The IDD is equipped with a write cache function in order to reduce the INIT's
command processing time. If that operation is permitted by the MODE SELECT
command (caching parameters: Page code = 8, WCE bit), at the point when the
IDD completes the transfer of all data specified in the WRITE or WRITE
EXTENDED command, it reports the GOOD status and terminates the command.
If the write cache function is permitted, data transferred form the
INIT by a WRITE or WRITE EXTENDED command are written to
the disk media after the GOOD status is reported, so when an
unrecoverable write error is detected in that write operation, sense
data is generated. When those sense data is being held, the IDD
ordinarily responds to the command that is executed next by a
"CHECK" status (deferred error), notifying the INIT that sense data
is being held. However, ordinarily, it is troublesome for the INIT to
retry when there is an unrecoverable error in a write cache
operation, so adequate caution should be exercised when using this
function.