Fujitsu MPG3XXXAH Product Manual page 20

(5) Error correction and retry by ECC
If a recoverable error occurs, the disk drive itself attempts error recovery. The 40 bytes ECC has
improved buffer error correction for correctable data errors.
(6) Write cache
When the disk drive receives a write command, the disk drive posts the command completion at
completion of transferring data to the data buffer completion of writing to the disk media. This
feature reduces the access time at writing.
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