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Reliability specifications

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5.0 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 Rates1 Recovered Data Unrecovered Data Miscorrected Data Interface error rate: Mean Time Between Failure (MTBF): Annualized Failure Rate (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 1. Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated. 5.1 Error 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 6.2, "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 Recovereable 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. Savvio 15K SAS Product Manual, Rev. C 15

Section	Page
1.0 Scope	7
2.0 Applicable standards and reference documentation	9
2.1 Standards	9
2.1.1 Electromagnetic compatibility	9
2.1.1.1 Electromagnetic susceptibility	9
2.1.2 Electromagnetic compliance	10
2.1.3 European Union Restriction of Hazardous Substances (RoHS)	11
2.2 Reference documents	11
3.0 General description	13
3.1 Standard features	14
3.2 Media description	14
3.3 Performance	14
3.4 Reliability	15
3.5 Formatted capacities	15
3.6 Programmable drive capacity	15
3.7 Factory-installed accessories	15
3.8 Options	16
4.0 Performance characteristics	17
4.1 Internal drive characteristics	17
4.2 Seek performance characteristics	17
4.2.1 Access time (Gen 2.0 LP data)	17
4.2.2 Format command execution time	18
4.2.3 General performance characteristics	18
4.3 Start/stop time	18
4.4 Prefetch/multi-segmented cache control	18
4.5 Cache operation	19
4.5.1 Caching write data	19
4.5.2 Prefetch operation	20
5.0 Reliability specifications	21
5.1 Error rates	21
5.1.1 Recoverable Errors	21
5.1.2 Unrecoverable Errors	21
5.1.3 Seek errors	22
5.1.4 Interface errors	22
5.2 Reliability and service	22
5.2.1 Annualized Failure Rate (AFR) and Mean Time Between Failure (MTBF)	22
5.2.2 Preventive maintenance	22
5.2.3 Hot plugging the drive	22
5.2.4 S.M.A.R.T.	23
5.2.5 Thermal monitor	24
5.2.6 Drive Self Test (DST)	24
5.2.6.1 DST failure definition	25
5.2.6.2 Implementation	25
5.2.6.2.1 State of the drive prior to testing	25
5.2.6.2.2 Invoking DST	25
5.2.6.2.3 Short and extended tests	25
5.2.6.2.4 Log page entries	26
5.2.6.2.5 Abort	26
5.2.7 Product warranty	26
6.0 Physical/electrical specifications	29
6.1 AC power requirements	29
6.2 DC power requirements	29
6.2.1 Conducted noise immunity	31
6.2.2 Power sequencing	31
6.2.3 Current profiles	31
6.3 Power dissipation	33
6.4 Environmental limits	35
6.4.1 Temperature	35
6.4.2 Relative humidity	35
6.4.3 Effective altitude (sea level)	36
6.4.4 Shock and vibration	36
6.4.4.1 Shock	36
6.4.4.2 Vibration	38
6.4.5 Air cleanliness	38
6.4.6 Corrosive environment	38
6.4.7 Acoustics	39
6.4.8 Electromagnetic susceptibility	39
6.5 Mechanical specifications	40
7.0 Defect and error management	41
7.1 Drive internal defects/errors	41
7.2 Drive error recovery procedures	41
7.3 SAS system errors	42
7.4 Background Media Scan	43
7.5 Media Pre-Scan	43
7.6 Deferred Auto-Reallocation	43
7.7 Idle Read After Write	44
8.0 Installation	45
8.1 Drive orientation	45
8.2 Cooling	46
8.3 Drive mounting	47
8.4 Grounding	47
9.0 Interface requirements	49
9.1 SAS features	49
9.1.1 task management functions	49
9.1.2 Task management responses	49
9.2 Dual port support	50
9.3 SCSI commands supported	51
9.3.1 Inquiry data	55
9.3.2 Mode Sense data	55
9.4 Miscellaneous operating features and conditions	59
9.4.1 SAS physical interface	60
9.4.2 Physical characteristics	63
9.4.3 Connector requirements	63
9.4.4 Electrical description	63
9.4.5 Pin descriptions	63
9.4.6 SAS transmitters and receivers	64
9.4.7 Power	65
9.5 Signal characteristics	65
9.5.1 Ready LED Out	65
9.5.2 Differential signals	65
9.5.2.1 Eye masks	66
9.5.2.1.1 Eye masks overview	66
9.5.2.1.2 Receive eye mask	66
9.5.2.1.3 Jitter tolerance masks	67
9.5.2.2 Transmitter signal characteristics	68
9.5.2.3 Receiver signal characteristics	69
9.5.2.3.1 Jitter	70
9.5.2.3.2 Receiver jitter tolerance	70
9.5.2.3.3 Compliant jitter test pattern (CJTPAT)	70
9.5.2.3.4 Impedance specifications	71
9.5.2.4 Electrical TxRx connections	72
9.5.2.4.1 Transmitter characteristics	72
9.5.2.5 Receiver characteristics	75
10.0 Seagate Technology support services	77
Numerics	79
A	79
B	79
C	79
D	79
E	79
F	80
G	80
H	80
I	80
J	80
L	80
M	80
N	81
O	81
P	81
Q	81
R	81
S	81
T	82
U	82
V	82
W	82

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Savvio 15K SAS Product Manual, Rev. C

5.0

Reliability 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.

5.1

Error 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 6.2, "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

Recovereable 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 recov-

ered 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 opera-

tions, 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.

Seek error rate:

Less than 10 errors in 10

seeks

Read Error Rates

Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.

Recovered Data

Less than 10 errors in 10

bits transferred (OEM default settings)

Unrecovered Data

Less than 1 sector in 10

bits transferred

Miscorrected Data

Less than 1 sector in 10

bits transferred

Interface error rate:

Less than 1 error in 10

bits transferred

Mean Time Between Failure (MTBF):

1,600,000 hours

Annualized Failure Rate (AFR)

0.55%

Preventive maintenance:

None required