Seagate ST3300655LC Cheetah 15K.7 SAS Product Manual - Page 19
Reliability specifications
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6.0 Reliability specifications The following reliability specifications assume correct host and drive operational interface, including all interface timings, power supply voltages, environmental requirements and drive mounting constraints. Seek error rate: Read Error Rates Recovered Data Unrecovered Data Miscorrected Data Interface error rate: MTBF AFR Preventive maintenance: Less than 10 errors in 108 seeks Less than 10 errors in 1012 bits transferred (OEM default settings) Less than 1 sector in 1016 bits transferred Less than 1 sector in 1021 bits transferred Less than 1 error in 1012 bits transferred 1,600,000 hours 0.55% None required 6.1 Error 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 7.2). • 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 6.1.1 Recoverable 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 on-the-fly correction alone is not considered a Recovered Data error. 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. 6.1.2 Unrecoverable Errors Unrecoverable Data Errors (Sense Key = 03h) are specified at less than 1 sector in error per 1016 bits transferred. Unrecoverable Data Errors resulting from the same cause are treated as 1 error for that block. Cheetah 15K.7 SAS Product Manual, Rev. C 13