Seagate ST3600002SS Performance characteristics, Internal drive characteristics, Seek performance

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5.0Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Cheetah NS SAS drives.

5.1Internal drive characteristics

	ST3600002SS	ST3450802SS	GB (formatted, rounded off value)*
Drive capacity	600	450	GB (formatted, rounded off value)*
Read/write data heads	8	6
Tracks per inch	165,000	165,000	TPI
Peak bits per inch	1,347	1,347	kBPI
Areal Density	225	225	Gb/inch2
Internal data rate	1.01 to 1.84	1.01 to 1.84	Gb/sec (variable with zone)
Disk rotation speed	10K	10K	rpm
Avg rotational latency	2.98	2.98	ms

*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment and formatting.

5.2Seek performance

See Section 10.4.1, "SAS physical interface" on page 49 and the SAS Interface Manual (part number 100293071) for additional timing details.

5.2.1Access time

Not Including controller overhead1, 2 (ms)

		Read	Write
Average	Typical	3.8	4.4
Single track	Typical	0.22	0.22
Full stroke	Typical	8.1	8.7

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.

Cheetah NS 10K.2 SAS Product Manual, Rev. F

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Contents ST3600002SS ST3450802SS Cheetah NS 10K.2 SASPage Contents Installation Defect and error managementInterface requirements Seagate Online Support and Services Seagate Technology support servicesScope Standards Standards, compliance and reference documentsElectromagnetic compatibility Electromagnetic susceptibilityCompliance Reference documents General description Media description Standard featuresPerformance ReliabilityFormatted capacities Factory-installed optionsProgrammable drive capacity Internal drive characteristics Performance characteristicsAccess time Seek performanceGeneral performance characteristics Format command execution time minutesStart/stop time Cache operation Prefetch/multi-segmented cache controlCaching write data Prefetch operation Error rates Reliability specificationsRecoverable Errors Unrecoverable ErrorsInterface errors Reliability and servicePreventive maintenance Hot plugging the driveControlling S.M.A.R.T 4 S.M.A.R.TPerformance impact Reporting controlPredictive failures Temperature Log Page 0Dh Parameter Code DescriptionThermal monitor Drive Self Test DSTImplementation DST failure definitionShort test Function Code 001b Product warrantyExtended test Function Code 010b Shipping AC power requirements Physical/electrical specificationsDC power requirements ST3600002SS DC power requirementsGeneral DC power requirement notes ST3450802SS DC power requirementsConducted noise immunity Power sequencingCurrent profiles Typical ST3600002SS drive +5V and +12V current profiles ST3600002SS Power dissipationST3450802SS Environmental limits Temperature a. OperatingEffective altitude sea level a. Operating Relative humidityShock and vibration ShockRecommended mounting Vibration a. Operating-normal Air cleanlinessAcoustics Corrosive environmentChina Restriction of Hazardous Substances RoHS Directive Physical dimensions Mechanical specificationsDrive internal defects/errors Defect and error managementDrive error recovery procedures 77.81 Background Media Scan SAS system errorsMedia Pre-Scan Deferred Auto-ReallocationIdle Read After Write Drive orientation InstallationAir flow CoolingGrounding Drive mountingInterface requirements SAS featuresDual port support Commands supported by Cheetah NS 10K.2 SAS family drives Scsi commands supportedCommands supported by Cheetah NS 10K.2 SAS family drives Commands supported by Cheetah NS 10K.2 SAS family drives Commands supported by Cheetah NS 10K.2 SAS family drives 10.3.2Mode Sense data Inquiry dataPage Mode Pages 10.3.2.1 ST3600002SS Mode Sense data10.3.2.2 ST3450802SS Mode Sense data Miscellaneous features Miscellaneous operating features and conditionsMiscellaneous status SAS physical interface Datum B Connector requirements Physical characteristicsPin descriptions Electrical descriptionSAS pin descriptions Power Signal characteristicsSAS transmitters and receivers Ready LED OutDifferential signals LED drive signalGeneral interface characteristics 10.5.2.1 Eye masks 10.5.2.1.1 Eye masks overviewReceive eye mask 2OP 0, 5 xadditional sinusoidal jitter X 1OP Transmitter signal characteristics Maximum allowable jitter Receiver signal characteristicsImpedance requirements Sheet 1 Compliant jitter test pattern CjtpatElectrical TxRx connections Impedance requirements Sheet 2= -5, 437dB Shows the zero-length test load Receiver characteristics SAS-2 Specification complianceAdditional information Cheetah NS 10K.2 SAS Product Manual, Rev. F Index Page SAS See also cooling Page Americas Seagate Technology LLC

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