5.0Reliability specifications
The following reliability specifications assume correct host and drive operational interface, including all inter- face timings, power supply voltages, environmental requirements and drive mounting constraints.
Seek error rate:Less than 10 errors in 108 seeks
Read Error Rates
Recovered Data
Unrecovered Data
Miscorrected Data
Interface error rate:
MTBF
AFR
Preventive maintenance:
5.1Error rates
The error rates stated in this manual assume the following:
•The drive is operated per this specification using DC power as defined in this manual (see Section 6.2).
•Errors caused by host system failures are excluded from error rate computations.
•Assume random data.
•Default OEM error recovery settings are applied. This includes AWRE, ARRE, full read retries, full write retries and full retry time.
•Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated
5.1.1Recoverable Errors
Recoverable errors are those detected and corrected by the drive, and do not require user intervention.
Recoverable Data errors use retries and correction. Application of ECC
Recovered Data error rate is determined using read bits transferred for recoverable errors occurring during a read, and using write bits transferred for recoverable errors occurring during a write.
5.1.2Unrecoverable Errors
Unrecoverable Data Errors (Sense Key = 03h) are specified at less than 1 sector in error per 1016 bits trans- ferred. Unrecoverable Data Errors resulting from the same cause are treated as 1 error for that block.
12 | Cheetah 15K.7 SAS Product Manual, Rev. A |
