Fujitsu MAA3182FC Series, Manual

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C141-E054-02EN 4 - 84
If the write cache function is enabled, the IDD reports a status byte at the point when reception
of all the data transferred from the INIT is completed. If an error occurs while data are being
written to the disk media, a CHECK CONDITION status is reported for the command to be
executed next. If the write cache function is disabled, a status byte is reported after writing to
the disk media of all the data transferred from the INIT is completed, then execution of the
command is terminated.
IMPORTANT
Even when there is an error in the specification in the CDB, or
when a write operation to the disk media cannot be executed
normally due to various other causes, the transfer of data (data is
pre-fetched to the data buffer) from the INIT to the IDD may be
executed. In this case, the length of data transferred from the
INIT to the IDD is undefined. Also, all the data transferred to the
IDD will not necessarily be actually written to the disk media.
However, if the command is terminated with a CHECK
CONDITION status and the sense key of the sense data indicates
"ILLEGAL REQUEST [=5]," the data from that command is not
written to the disk media by a write operation.