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7.4 Background Media Scan (BMS)
C141-C013 397
If a scan ends with an error, the next Pre-Scan operation will begin with LBA 0.
If the Write command is issued to an LBA that was not scanned, this LBA will be
verified after data is written to it. (For further information, see the next section.)
7.4.2.3 Write command operation during a Pre-Scan
If the Write command is issued to an LBA that has yet to be scanned, the Write
command will function as a Write&Verify command during the Pre-Scan period.
The operation is generally the same as when the typical Write&Verify command
is issued. However, the sense information is as follows:
Write Verify Error code
Good Good
−
Successful rewrite
−
Successful alternate processing 01-0C-81
Alternate processing error 03-0C-03
Too many retries 03-0C-03
Error
−
Write error code
• PER
Entirely based on the Mode Page 1 PER configuration.
7.4.2.4 Conditions for operation
The conditions that suppress scanning include the following:
• Not Ready status
During a scan, automatic alternate processing is performed based on the ARRE
specification. If the power is switched off during a scan and then switched back
on, a scan will begin with the LBA in operation when the power was switched off
(within a 1% error). It will actually begin after a 500-ms idle time. When a scan
ends, Log Save is performed.
The conditions that stop scanning include the following:
• A hardware error is detected.
• Status expected to lead to failure is detected.
• Formatting is performed without a P-List.
• Format Corrupted is encountered.
• The temperature drops below 10°C or exceeds 60°C.