Reliability Specifications; Error Rates; Recoverable Errors; Unrecoverable Errors - Seagate Constellation ST4000NM0023 Product Manual

5.0 R
ELIABILITY 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:
1
Read Error Rates
Recovered Data
Unrecovered Data
Miscorrected Data
Interface error rate:
Mean Time Between Failure (MTBF):
Annualized Failure Rate (AFR):
Preventive maintenance:
1. Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.
5.1 E
RROR RATES
The error rates stated in this manual assume the following:
• The drive is operated in accordance with this manual using DC power as defined in paragraph 6.3, "DC power requirements."
• 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.
5.1.1

Recoverable Errors

Recoverable errors are those detected and corrected by the drive, and do not require user intervention.
Recoverable Data errors will use correction, although ECC on-the-fly is not considered for purposes of recovered error specifications.
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.
5.1.2

Unrecoverable Errors

An unrecoverable data error is defined as a failure of the drive to recover data from the media. These errors occur due to head/media or
write problems. Unrecoverable data errors are only detected during read operations, but not caused by the read. If an unrecoverable data
error is detected, a MEDIUM ERROR (03h) in the Sense Key will be reported. Multiple unrecoverable data errors resulting from the
same cause are treated as 1 error.
5.1.3

Seek errors

A seek error is defined as a failure of the drive to position the heads to the addressed track. After detecting an initial seek error, the drive
automatically performs an error recovery process. If the error recovery process fails, a seek positioning error (Error code = 15h or 02h)
will be reported with a Hardware error (04h) in the Sense Key. Recoverable seek errors are specified at Less than 10 errors in 10
Unrecoverable seek errors (Sense Key = 04h) are classified as drive failures.
5.1.4

Interface errors

An interface error is defined as a failure of the receiver on a port to recover the data as transmitted by the device port connected to the
receiver. The error may be detected as a running disparity error, illegal code, loss of word sync, or CRC error.
5.2 R
ELIABILITY AND SERVICE
You can enhance the reliability of Constellation ES.3 disk drives by ensuring that the drive receives adequate cooling. Section 6.0
provides temperature measurements and other information that may be used to enhance the service life of the drive. Section 10.2 provides
recommended air-flow information.
C ES.3 SAS P
ONSTELLATION
Less than 10 errors in 10
Less than 10 errors in 10
Less than 1 sector in 10
Less than 1 sector in 10
Less than 1 error in 10
1,400,000 hours
0.63%
None required
M , R . C
RODUCT ANUAL EV
seeks
8
bits transferred (OEM default settings)
12
15 bits transferred
21 bits transferred
12 bits transferred
8
seeks.
12