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Seagate ST936751SS, ST973451SS manual Performance characteristics, Internal drive characteristics

Models: ST936751SS ST973451SS

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4.0Performance characteristics

4.0Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Sav- vio drives.

4.1Internal drive characteristics

	ST973451SS	ST936751SS
Drive capacity	73.4	36.7	Gbytes (formatted, rounded off value)
Read/write data heads	4	2
Tracks per surface (total)	42,554	42,554	Tracks (user accessible including spare tracks)
Tracks per inch	150	150	kTPI (average)
Peak bits per inch	861.81	861.81	kBPI
Areal density	130.58	130.58	Gbit/in2
Internal data rate	957.51 to 1,282.08	957.51 to 1,282.08 Mbits/sec (variable with zone)
Disc rotation speed	15k	15k	rpm
Avg rotational latency	2	2	msec

4.2Seek performance characteristics

See Section 9.4.1, "SAS physical interface" on page 54 and the SAS Interface Manual (part number 100293071) for additional timing details.

4.2.1Access time (Gen 2.0 LP data)

Not including controller overhead (msec)

		Read	Write
Average	Typical1,2	2.9	3.3
Single track	Typical1,2	0.2	0.4
Full stroke	Typical1,2	5.1	5.5

1.Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives.

2.Access to data = access time + latency time.

Savvio 15K SAS Product Manual, Rev. B

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Seagate ST936751SS manual Performance characteristics, Internal drive characteristics, Seek performance characteristics

Contents

100407739 Rev. B Savvio 15K SASPRODUCT MANUAL ST973451SS ST936751SSMarch Initial release Revision status summary sheetRev. A 09/15/06Savvio 15K SAS Product Manual, Rev. B 6.0 Physical/electrical specifications Contents4.0 Performance characteristics 5.0 Reliability specifications9.0 Interface requirements 7.0 Defect and error management8.0 Installation 10.0 Seagate Technology support servicesList of Figures Page 1.0 Scope Savvio 15K SAS Product Manual, Rev. B 2.1.1.1 Electromagnetic susceptibility 2.0 Applicable standards and reference documentation2.1 Standards 2.1.1 Electromagnetic compatibilityKorean MIC 2.1.2 Electromagnetic complianceElectromagnetic compliance for the European Union Australian C-Tick2.1.3 European Union Restriction of Hazardous Substances RoHS 2.2 Reference documentsSCSI Commands Reference Manual SAS Interface Manual Specification for Acoustic Test Requirement and ProceduresSavvio 15K SAS Product Manual, Rev. B 3.0 General description 3.2 Media description 3.1 Standard features3.3 Performance 3.6 Programmable drive capacity 3.7 Factory-installed accessories3.4 Reliability 3.5 Formatted capacities3.8 Options 4.2.1 Access time Gen 2.0 LP data 4.0 Performance characteristics4.1 Internal drive characteristics 4.2 Seek performance characteristicsGeneral performance characteristics 4.2.2 Format command execution time4.2.3 4.4 Prefetch/multi-segmented cache control 4.3 Start/stop time4.5 Cache operation 4.5.2 Prefetch operation 4.5.1 Caching write data5.1.2 Unrecoverable Errors 5.0 Reliability specifications5.1 Error rates 5.1.1 Recoverable Errors5.2.2 Preventive maintenance 5.2 Reliability and service5.1.3 Seek errors 5.1.4 Interface errors5.2.4 S.M.A.R.T Maximum processing delayOn-line only delay Fully-enabled delayParameter Code Temperature Log Page 0DhPredictive failures 5.2.5 Thermal monitor5.2.6.2.2 Invoking DST 5.2.6.2.1 State of the drive prior to testing5.2.6.1 DST failure definition 5.2.6.2 Implementation5.2.6.2.4 Log page entries 5.2.7 Product warrantyShort test Function Code 001b Extended test Function Code 010bProduct repair and return information ShippingSavvio 15K SAS Product Manual, Rev. B Table 2 ST973451SS DC power requirements 6.0 Physical/electrical specifications6.1 AC power requirements 6.2 DC power requirementsGeneral DC power requirement notes ST936751SS DC power requirementsFigure 1. Typical ST973451SS current profile 6.2.2 Power sequencing6.2.1 Conducted noise immunity 6.2.3 Current profilesFigure 2. Typical ST936751SS current profile Savvio 15K SAS Product Manual, Rev. BST973451SS in 3 Gbit operation 6.3 Power dissipationST973451SS in 1.5 Gbit operation ST936751SS in 1.5 Gbit operation ST936751SS in 3 Gbit operation12 Vo lt A 6.4.1 Temperature 6.4 Environmental limits6.4.2 Relative humidity 6.4.4 Shock and vibration 6.4.3 Effective altitude sea level6.4.4.1 Shock Figure 8. Recommended mounting Packaged/product weightPackage size Drop height6.4.4.2 Vibration 6.4.5 Air cleanliness6.4.6 Corrosive environment 6.4.8 Electromagnetic susceptibility 6.4.7 AcousticsFigure 9. Mounting configuration dimensions 6.5 Mechanical specifications7.1 Drive internal defects/errors 7.0 Defect and error management7.2 Drive error recovery procedures Maximum recovery time per 7.3 SAS system errorsTable 4 Read and write retry count maximum recovery times Maximum recovery time per7.5 Media Pre-Scan 7.4 Background Media Scan7.6 Deferred Auto-Reallocation 7.7 Idle Read After Write 8.1 Drive orientation 8.0 InstallationFigure 11. Air flow 8.2 Cooling8.4 Grounding 8.3 Drive mountingSavvio 15K SAS Product Manual, Rev. B SAS task management functions supported 9.1 SAS features9.0 Interface requirements 9.1.1 task management functions9.2 Dual port support Commands supported by Savvio SAS family drive 9.3 SCSI commands supportedCommands supported by Savvio SAS family drive continued Commands supported by Savvio SAS family drive continued Commands supported by Savvio SAS family drive continued Bytes 9.3.2 Mode Sense data9.3.1 Inquiry data Savvio inquiry dataSavvio 15K SAS Product Manual, Rev. B CHG = Changeable bits indicates if default value is changeable3. Current values 4. Changeable valuesMODE DATA HEADER 03 fa 00 10 00 00 00 BLOCK DESCRIPTOR Savvio 15K SAS Product Manual, Rev. B Miscellaneous features 9.4 Miscellaneous operating features and conditionsMiscellaneous status Figure 12. Physical interface 9.4.1 SAS physical interfaceC OF DATUM B L Figure 13. SAS device plug dimensionsTO DATUM A Figure 14. SAS device plug dimensions detail9.4.5 Pin descriptions 9.4.2 Physical characteristics9.4.3 Connector requirements 9.4.4 Electrical descriptionDifferential Transfer Medium Table 13 SAS pin descriptions9.4.6 SAS transmitters and receivers TX Transmitter 100 TY9.5.2 Differential signals 9.5 Signal characteristics9.4.7 Power LED drive signal9.5.2.1.2 Receive eye mask Table 16 General interface characteristicsCharacteristic 9.5.2.1 Eye masks 9.5.2.1.1 Eye masks overviewFigure 17. Reveive tolerance eye mask 9.5.2.1.3 Jitter tolerance maskssinusoidal 9.5.2.2 Transmitter signal characteristicsTable 17 Transmitter signal characteristics Peak-toa All tests in this table shall be performed with zero-length test load shown in figure Table 17 Transmitter signal characteristics9.5.2.3 Receiver signal characteristics Table 18 Receiver signal characteristics9.5.2.3.3 Compliant jitter test pattern CJTPAT 9.5.2.3.1 JitterTable 19 Maximum allowable jitter 9.5.2.3.2 Receiver jitter toleranceTable 21 Impedance requirements Sheet 1 of 9.5.2.3.4 Impedance specificationsTable 21 Impedance requirements Sheet 2 of 9.5.2.4.1 Transmitter characteristics9.5.2.4 Electrical TxRx connections = -10, 884dB = -5, 437dBTx+ TCTF Tx Figure 21. ISI loss example at 3.0 Gbps Figure 20. Zero-length test loadFigure 22. ISI loss example at 1.5 Gbps 9.5.2.5 Receiver characteristics Savvio 15K SAS Product Manual, Rev. B Presales Support 10.0 Seagate Technology support servicesSeagate Service Centers InternetAsia/Pacific Support Services Customer Service OperationsUSA/Canada/Latin America support services Europe, the Middle East and Africa Support ServicesIndex NumericsPage Page See also cooling Page 920 Disc Drive, Scotts Valley, California 95066-4544, USA Seagate Technology LLCPublication Number 100407739, Rev. B, Printed in USA