Hitachi HTS725050A9A364 Datasheet download pdf (Page 23)

7K500 OEM SPECIFICATION

Page 23 of 176

5.5

5.55.5

5.5 Data buffer test

Data buffer testData buffer test

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

5.65.6

5.6 Error recovery

Error recoveryError recovery

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 non-recoverable errors.

5.7

5.75.7

5.7 Automatic reallocation

Automatic reallocationAutomatic reallocation

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

5.7.15.7.1

5.7.1

Non

NonNon

Non-

-recovered write errors

recovered write errorsrecovered write errors

recovered 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

5.7.25.7.2

5.7.2

Non

NonNon

Non-

-recoverable read error

recoverable read errorrecoverable read error

recoverable 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

5.7.35.7.3

5.7.3

Recovered read errors

Recovered read errorsRecovered read errors

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.

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