Datasheet

5.5 Data buffer test
The data buffer is tested at Power-on-reset. The test consists of a write/read "00"x and "ff"x pattern on
each buffer position.
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 procedures are reported to the host
system as nonrecoverable errors.
5.7 Automatic reallocation
The sectors those show some errors may be reallocated automatically when specific conditions are met.
The drive does not report automatic reallocation to the host system. The conditions for automatic
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 sector(s) 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 Nonrecovered read errors
When a read operation has failed after defined 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 auto-
matically. When the result of this verification meets the criteria, this sector is reallocated.
5.7.3 Recovered read errors
When a read operation for a sector fails once and is then recovered at the specific ERP step, this sector
is reallocated automatically. A media verification sequence may be run prior to the reallocation according
to the predefined conditions.
Hard disk drive specification for DSCM-11000/-10512/-10340
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