IBM DTCA-24090 Hard Drive Specifications - Page 24

WRITE Safety, Data buffer test, Error Recovery, Automatic Reallocation

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4.4 WRITE Safety The drive ensures that the data is written into the disk media properly. Following conditions are monitored during a write operation. When one of those conditions exceeds the criteria, the write operation is terminated and automatic retry sequence will be invoked. Head off track External shock Low supply voltage Spindle speed tolerance 4.5 Data buffer test The data buffer is tested at Power-on-reset and when a drive self-test is requested by the host. The tests are consisted of write/read '00'x and 'ff'x pattern on all buffer. 4.6 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 non-recoverable errors. 4.7 Automatic Reallocation The sectors those show some errors may be reallocated automatically when specific conditions are met. The spare sectors for reallocation are located at the end of drive. As a result of reallocation, the physical location of logically sequenced sectors will be dispersed. The drive does not report for auto-reallocation to the host system. The conditions for auto-reallocation are described below. 4.7.1 Non Recovered Write Errors When a write operation can not 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 is failed. 4.7.2 Non Recovered Read Errors When a read operation is failed after defined E R P 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 criteria, this sector is reallocated. 16 OEM Specifications of DTCA-2xxxx 2.5 inch H D D

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4.4
WRITE Safety
The drive ensures that the data is written into the disk media properly. Following conditions are monitored
during a write operation. When one of those conditions exceeds the criteria, the write operation is terminated
and automatic retry sequence will be invoked.
Head off track
External shock
Low supply voltage
Spindle speed tolerance
4.5
Data buffer test
The data buffer is tested at Power-on-reset and when a drive self-test is requested by the host. The tests are
consisted of write/read '00'x and 'ff'x pattern on all buffer.
4.6
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 non-recoverable errors.
4.7
Automatic Reallocation
The sectors those show some errors may be reallocated automatically when specific conditions are met.
The
spare sectors for reallocation are located at the end of drive.
As a result of reallocation, the physical location
of logically sequenced sectors will be dispersed.
The drive does not report for auto-reallocation to the host
system.
The conditions for auto-reallocation are described below.
4.7.1
Non Recovered Write Errors
When a write operation can not 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 is failed.
4.7.2
Non Recovered Read Errors
When a read operation is 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 automatically.
When the result of this verification meets the criteria, this sector is reallocated.
16
OEM Specifications of DTCA-2xxxx 2.5 inch HDD