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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

Section	Page
1.0 Seagate Technology support services	7
2.0 Scope	8
3.0 Standards, compliance and reference documents	9
3.1 Standards	9
3.1.1 Electromagnetic compatibility	9
3.1.1.1 Electromagnetic susceptibility	9
3.2 Compliance	10
3.2.1 Electromagnetic compliance	10
3.3 European Union Restriction of Hazardous Substances (RoHS)	10
3.4 Reference documents	11
4.0 General description	12
4.1 Standard features	13
4.2 Media description	13
4.3 Performance	13
4.4 Reliability	14
4.5 Formatted capacities	14
4.6 Programmable drive capacity	14
4.7 Factory-installed options	14
5.0 Performance characteristics	15
5.1 Internal drive characteristics	15
5.2 Seek time	15
5.2.1 Access time	15
5.2.2 Format command execution time (minutes)	16
5.2.3 General performance characteristics	16
5.3 Start/stop time	16
5.4 Prefetch/multi-segmented cache control	17
5.5 Cache operation	17
5.5.1 Caching write data	18
5.5.2 Prefetch operation	18
6.0 Reliability specifications	19
6.1 Error rates	19
6.1.1 Recoverable Errors	19
6.1.2 Unrecoverable Errors	19
6.1.3 Seek errors	20
6.1.4 Interface errors	20
6.2 Reliability and service	20
6.2.1 Annualized Failrue Rate (AFR) and Mean time between failure (MTBF)	20
6.2.2 Preventive maintenance	20
6.2.3 Hot plugging the drive	20
6.2.4 S.M.A.R.T.	21
6.2.5 Thermal monitor	22
6.2.6 Drive Self Test (DST)	23
6.2.6.1 DST failure definition	23
6.2.6.2 Implementation	23
6.2.7 Product warranty	25
7.0 Physical/electrical specifications	26
7.1 AC power requirements	26
7.2 DC power requirements	26
7.2.1 Conducted noise immunity	30
7.2.2 Power sequencing	30
7.2.3 Current profiles	30
7.3 Power dissipation	33
7.4 Environmental limits	35
7.4.1 Temperature	35
7.4.2 Relative humidity	36
7.4.3 Effective altitude (sea level)	36
7.4.4 Shock and vibration	36
7.4.4.1 Shock	36
7.4.4.2 Vibration	38
7.4.5 Acoustics	39
7.4.6 Air cleanliness	39
7.4.7 Corrosive environment	39
7.4.8 RoHS compliance statement	39
7.4.9 Electromagnetic susceptibility	40
7.5 Mechanical specifications	40
8.0 About FIPS	41
9.0 About self-encrypting drives	42
9.1 Data encryption	42
9.2 Controlled access	42
9.2.1 Admin SP	42
9.2.2 Locking SP	42
9.2.3 Default password	43
9.3 Random number generator (RNG)	43
9.4 Drive locking	43
9.5 Data bands	43
9.6 Cryptographic erase	43
9.7 Authenticated firmware download	43
9.8 Power requirements	44
9.9 Supported commands	44
10.0 Defect and error management	45
10.1 Drive internal defects/errors	45
10.2 Drive error recovery procedures	45
10.3 SAS system errors	47
10.4 Background Media Scan	47
10.5 Media Pre-Scan	48
10.6 Deferred Auto-Reallocation	48
10.7 Idle Read After Write	48
11.0 Installation	49
11.1 Drive orientation	49
11.2 Cooling	49
11.3 Drive mounting	50
11.4 Grounding	50
12.0 Interface requirements	51
12.1 SAS features	51
12.1.1 task management functions	51
12.1.2 task management responses	51
12.2 Dual port support	52
12.3 SCSI commands supported	52
12.3.1 Inquiry data	56
12.3.2 Mode Sense data	57
12.3.2.1 600GBmodel Mode Sense data	58
12.3.2.2 450GB model Mode Sense data	60
12.3.2.3 300GB model Mode Sense data	62
12.4 Miscellaneous operating features and conditions	63
12.4.1 SAS physical interface	64
12.4.2 Physical characteristics	66
12.4.3 Connector requirements	66
12.4.4 Electrical description	67
12.4.5 Pin descriptions	67
12.4.6 SAS transmitters and receivers	68
12.4.7 Power	68
12.5 Signal characteristics	68
12.5.1 Ready LED Out	68
12.5.2 Differential signals	69
12.6 SAS-2 Specification compliance	69
12.7 Additional information	69
Numerics	71
A	71
B	71
C	71
D	71
E	72
F	72
G	72
H	72
I	72
J	72
L	72
M	72
N	73
O	73
P	73
Q	73
R	73
S	73
T	74
U	74
V	74
W	74

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Cheetah 15K.7 SAS Product Manual, Rev. C

6.0

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.

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 con-

sidered 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 10

bits trans-

ferred. Unrecoverable Data Errors resulting from the same cause are treated as 1 error for that block.

Seek error rate:

Less than 10 errors in 10

seeks

Read Error Rates

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

MTBF

1,600,000 hours

AFR

0.55%

Preventive maintenance:

None required