Fujitsu MAN3184MC - Enterprise 18.4 GB Hard Drive Product/Maintenance Manual page 51

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Automatic alternate block allocation at write operation
If the AWRE flag in the MODE SELECT parameter permits the automatic alternate block
allocation, the IDD executes reassign processing to all the existing sectors in the servo frame
where offtrack error occurred during WRITE or WRITE EXTENDED or WRITE AND VERIFY
command processing and in the next servo frame. After completing reassignment, WRITE or
WRITE EXTENDED command processing is successively executed for the following sectors.
Automatic alternate block allocation is made only once during the
execution of one command. If second defective block is detected, the
alternate block assignment processing for the first defective block is
executed but the alternate block assignment processing for the
second one is not executed and the command being executed
terminates. However, the initiator can recover the twice error by
issuing the same command again.
When an error is detected in a data block in the data area, recovery
data is rewritten and verified in automatic alternate block allocation
during the execution of the READ or READ EXTENDED command.
Alternate block allocation will not be made for the data block if
recovery is successful.
Example: Even if the data error which is recoverable by the WRITE
IMPORTANT
LONG command is simulated, automatic alternate block
allocation will not be made for the data block.
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