Hitachi HTS541680J9SA00 Specifications - Page 23

Data buffer test, Error recovery, Automatic reallocation - data recovery

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5.5 Travelstar 5K160 (SATA) Hard Disk Drive Specification Data buffer test The data buffer is tested at power on reset and when a drive self-test is requested by the host. The test consists of a write/read '00'x and 'ff'x pattern on all buffers. 5.6 Error recovery Errors occurring on the drive are handled by the error recovery procedure. Errors that are uncorrectable after application of the error recovery procedure are reported to the host system as nonrecoverable errors. 5.7 Automatic reallocation The sectors that show some errors may be reallocated automatically when specific conditions are met. The drive does not report any auto reallocation to the host system. The conditions for auto reallocation are described below. 5.7.1 Nonrecovered write errors When a write operation cannot be completed after the Error Recovery Procedure (ERP) is fully carried out, the sectors are reallocated to the spare location. An error is reported to the host system only when the write cache is disabled and the auto reallocation has failed. 5.7.2 Nonrecoverable read error When a read operation fails after ERP is fully carried out, a hard error is reported to the host system. This location is registered internally as a candidate for the reallocation. When a registered location is specified as a target of a write operation, a sequence of media verification is performed automatically. When the result of this verification meets the required criteria, this sector is reallocated. 5.7.3 Recovered read errors When a read operation for a sector fails and is recovered at the specific ERP step, the sector is reallocated automatically. A media verification sequence may be run prior to the reallocation according to the predefined conditions. 23/167

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Travelstar 5K160 (SATA) Hard Disk Drive Specification
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5.5
Data buffer test
The data buffer is tested at power on reset and when a drive self-test is requested by the host. The test
consists of a write/read '00'x and 'ff'x pattern on all buffers.
5.6
Error recovery
Errors occurring on the drive are handled by the error recovery procedure.
Errors that are uncorrectable after application of the error recovery procedure are reported to the host
system as nonrecoverable errors.
5.7
Automatic reallocation
The sectors that show some errors may be reallocated automatically when specific conditions are met.
The drive does not report any auto reallocation to the host system. The conditions for auto reallocation
are described below.
5.7.1
Nonrecovered write errors
When a write operation cannot be completed after the Error Recovery Procedure (ERP) is fully carried out,
the sectors are reallocated to the spare location. An error is reported to the host system only when the
write cache is disabled and the auto reallocation has failed.
5.7.2
Nonrecoverable read error
When a read operation fails after ERP is fully carried out, a hard error is reported to the host system. This
location is registered internally as a candidate for the reallocation. When a registered location is specified
as a target of a write operation, a sequence of media verification is performed automatically. When the
result of this verification meets the required criteria, this sector is reallocated.
5.7.3
Recovered read errors
When a read operation for a sector fails and is recovered at the specific ERP step, the sector is
reallocated automatically. A media verification sequence may be run prior to the reallocation according to
the predefined conditions.