Hitachi 100GB 7200 RPM HTE721010G9SA00 User Manual
Product codes
HTE721010G9SA00
Travelstar E7K100 (Serial ATA) Hard Disk Drive Specification
20
5.4 WRITE safety
The drive ensures that the data is written into the disk media properly. The conditions listed below are
monitored during a write operation. When one of these conditions exceeds the criteria, the write operation
is terminated and the automatic retry sequence is invoked.
monitored during a write operation. When one of these conditions exceeds the criteria, the write operation
is terminated and the automatic retry sequence is invoked.
•
Head off track
•
External shock
•
Low supply voltage
•
Spindle speed out of tolerance
•
Head open/short
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 con-
sists of a write/read '00'x and 'ff'x pattern on all buffers.
sists 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 procedures are reported to the host sys-
tem as non-recoverable errors.
tem as non-recoverable 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.
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.
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.
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 pre-
defined conditions.
automatically. A media verification sequence may be run prior to the reallocation according to the pre-
defined conditions.