Seagate ST936751SS, ST973451SS manual Performance characteristics, Internal drive characteristics

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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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Contents 100407739 Rev. B Savvio 15K SASPage Revision status summary sheet Savvio 15K SAS Product Manual, Rev. B Contents Interface requirements Defect and error managementInstallation Seagate Technology support servicesList of Figures Page Scope Savvio 15K SAS Product Manual, Rev. B Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibilityKorean MIC Electromagnetic complianceElectromagnetic compliance for the European Union Australian C-TickEuropean Union Restriction of Hazardous Substances RoHS Reference documentsSavvio 15K SAS Product Manual, Rev. B General description Media description Standard featuresPerformance Programmable drive capacity Factory-installed accessoriesReliability Formatted capacitiesOptions Access time Gen 2.0 LP data Performance characteristicsInternal drive characteristics Seek performance characteristicsGeneral performance characteristics Format command execution timePrefetch/multi-segmented cache control Start/stop timeCache operation Prefetch operation Caching write dataUnrecoverable Errors Reliability specificationsError rates Recoverable ErrorsPreventive maintenance Reliability and serviceSeek errors Interface errorsReporting control 4 S.M.A.R.TControlling S.M.A.R.T Performance impactParameter Code Description Temperature Log Page 0DhPredictive failures Thermal monitorInvoking DST State of the drive prior to testingDST failure definition ImplementationLog page entries Product warrantyShort test Function Code 001b Extended test Function Code 010bProduct repair and return information ShippingSavvio 15K SAS Product Manual, Rev. B ST973451SS DC power requirements Physical/electrical specificationsAC power requirements DC power requirementsGeneral DC power requirement notes ST936751SS DC power requirementsConducted noise immunity Power sequencingCurrent profiles Typical ST936751SS current profile ST973451SS in 3 Gbit operation Power dissipationST973451SS in 1.5 Gbit operation ST936751SS in 1.5 Gbit operation ST936751SS in 3 Gbit operationEnvironmental limits TemperatureRelative humidity Shock and vibration Effective altitude sea levelShock Recommended mounting Vibration Air cleanlinessCorrosive environment Acoustics Mounting configuration dimensions Mechanical specificationsDrive internal defects/errors Defect and error managementDrive error recovery procedures SAS system errors Media Pre-Scan Background Media ScanDeferred Auto-Reallocation Idle Read After Write Drive orientation InstallationAir flow CoolingGrounding Drive mountingSavvio 15K SAS Product Manual, Rev. B Interface requirements SAS featuresDual port support Commands supported by Savvio SAS family drive Scsi commands supportedCommands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Inquiry data Mode Sense dataSavvio inquiry data Page Mode Data Header 04 45 dc cc 00 00 02 Miscellaneous features Miscellaneous operating features and conditionsMiscellaneous status SAS physical interface Datum B Section C C Section a a Pin descriptions Physical characteristicsConnector requirements Electrical descriptionSAS transmitters and receivers SAS pin descriptionsSignal characteristics Eye masks Eye masks overview General interface characteristicsReceive eye mask Z1 OP Jitter tolerance masksJitter Transmitter signal characteristicsPeak-to SinusoidalReceiver signal characteristics Receiver jitter tolerance Maximum allowable jitterCompliant jitter test pattern Cjtpat Impedance requirements Sheet 1 Impedance specificationsImpedance requirements Sheet 2 Transmitter characteristicsElectrical TxRx connections = -5,437dB Shows the zero-length test load Receiver characteristics Savvio 15K SAS Product Manual, Rev. B Technical Support Seagate Technology support servicesInternet Presales SupportData Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Numerics IndexPage SAS See also cooling