IBM IC35L036UWDY10 Hard Drive Specifications - Page 223

Write Cache, 8 Automatic Defect Reallocation, Contingent Allegiance Condition is established..

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11.7 Write Cache If WCE (Mode Page 8) is set to one, the drive returns GOOD status and TASK COMPLETE message and goes to BUS FREE immediately after receiving the data of the last sector before actually writing the data onto the media. If the drive detects an error after it returns a GOOD status, the drive sets a Deferred Error (Error Code of sense data = 71h) and a following command will be returned with CHECK CONDITION and the Contingent Allegiance Condition is established.. 11.8 Automatic Defect Reallocation The drive supports Automatic Defect Reallocation (ADR) for read/write operation. When an ADR occurs, the read or write command takes longer to complete. This operation is sometimes referred to as auto reassignment due to its similarity to the operation performed by REASSIGN BLOCKS command. ADR is effective for read operation for the following commands; READ (6), READ (10), VERIFY, the verify portion of WRITE AND VERIFY when RARE (Mode Page 1) is set to one. From a certain step of ERP, a recovered sector during read operation is reallocated to a spare sector. If the recovered ERP step is considered to be appropriate to rewrite the original sector, the recovered data is rewritten to the original sector. If the read operation of rewritten data is successful, the ADR is canceled. When ARHES (Mode Page 0) is set to one, a unrecovered read error is internally registered as a reassign candidate and, when a WRITE command is received to the failing LBA, the data is written and verified if the error still exists. If the error still occurs on the failing LBA, it will be reassigned. If the error is cleared, the drive will remove the reassign candidate for the LBA. RARE and AWRE (Mode Page 1) do not affect ARHES operation and ARHES works independently. ADR for write operation is effective for the following commands; WRITE (6), WRITE (10), the write portion of WRITE AND VERIFY when AWRE is set to one. When a unrecovered error occurs during write operation, any error sector is reallocated to a spare sector. Ultrastar 146Z10 hard disk drive specifications 207

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11.7 Write Cache
If WCE (Mode Page 8) is set to one, the drive returns GOOD status and TASK COMPLETE message and
goes to BUS FREE immediately after receiving the data of the last sector before actually writing the data
onto the media.
If the drive detects an error after it returns a GOOD status, the drive sets a Deferred Error (Error Code of
sense data = 71h) and a following command will be returned with CHECK CONDITION and the
Contingent Allegiance Condition is established..
11.8 Automatic Defect Reallocation
The drive supports Automatic Defect Reallocation (ADR) for read/write operation. When an ADR occurs,
the read or write command takes longer to complete. This operation is sometimes referred to as auto
reassignment due to its similarity to the operation performed by REASSIGN BLOCKS command.
ADR is effective for read operation for the following commands; READ (6), READ (10), VERIFY, the verify
portion of WRITE AND VERIFY when RARE (Mode Page 1) is set to one. From a certain step of ERP, a
recovered sector during read operation is reallocated to a spare sector. If the recovered ERP step is
considered to be appropriate to rewrite the original sector, the recovered data is rewritten to the original
sector. If the read operation of rewritten data is successful, the ADR is canceled.
When ARHES (Mode Page 0) is set to one, a unrecovered read error is internally registered as a reassign
candidate and, when a WRITE command is received to the failing LBA, the data is written and verified if
the error still exists. If the error still occurs on the failing LBA, it will be reassigned. If the error is cleared,
the drive will remove the reassign candidate for the LBA. RARE and AWRE (Mode Page 1) do not affect
ARHES operation and ARHES works independently.
ADR for write operation is effective for the following commands; WRITE (6), WRITE (10), the write portion
of WRITE AND VERIFY when AWRE is set to one. When a unrecovered error occurs during write
operation, any error sector is reallocated to a spare sector.
Ultrastar 146Z10 hard disk drive specifications
207