Seagate ST3450802SS Performance characteristics, Internal drive characteristics, Seek performance

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4.0Performance characteristics

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

4.1Internal 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.

4.2Seek performance

See Section 9.4.1, "SAS physical interface" on page 48 and the SAS Interface Manual (part number 100293071) for additional timing details.

4.2.1Access 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.

8	Cheetah NS 10K.2 SAS Product Manual, Rev. C

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Contents Cheetah NS 10K.2 SAS ST3600002SS ST3450802SSPage Contents Defect and error management InstallationSeagate Technology support services Interface requirementsScope Standards, compliance and reference documents StandardsElectromagnetic compatibility Electromagnetic susceptibilityCompliance Reference documents General description Standard features Media descriptionPerformance ReliabilityFactory-installed options Formatted capacitiesProgrammable drive capacity Performance characteristics Internal drive characteristicsAccess time Seek performanceFormat command execution time minutes General performance characteristicsStart/stop time Prefetch/multi-segmented cache control Cache operationCaching write data Prefetch operation Reliability specifications Error ratesRecoverable Errors Unrecoverable ErrorsReliability and service Interface errorsPreventive maintenance Hot plugging the drive4 S.M.A.R.T Controlling S.M.A.R.TPerformance impact Reporting controlTemperature Log Page 0Dh Parameter Code Description Predictive failuresThermal monitor Drive Self Test DSTDST failure definition ImplementationProduct warranty Short test Function Code 001bExtended test Function Code 010b Shipping Physical/electrical specifications AC power requirementsDC power requirements ST3600002SS DC power requirementsST3450802SS DC power requirements General DC power requirement notesPower sequencing Conducted noise immunityCurrent profiles Typical ST3600002SS drive +5V and +12V current profiles Power dissipation ST3600002SSST3450802SS Temperature a. Operating Environmental limitsRelative humidity Effective altitude sea level a. OperatingShock and vibration ShockPackage size Packaged/product weight Drop height Recommended mountingAir cleanliness Vibration a. Operating-normalAcoustics Corrosive environmentChina Restriction of Hazardous Substances RoHS Directive Mechanical specifications Physical dimensionsDefect and error management Drive internal defects/errorsDrive error recovery procedures 77.81 SAS system errors Background Media ScanMedia Pre-Scan Deferred Auto-ReallocationIdle Read After Write Installation Drive orientationCooling Air flowDrive mounting GroundingSAS features Interface requirementsDual port support Scsi commands supported Commands supported by Cheetah NS 10K.2 SAS family drivesCommands 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 Inquiry data 2Mode Sense dataBytes Data hex Page 2.1 ST3600002SS Mode Sense data Mode Pages2.2 ST3450802SS Mode Sense data Miscellaneous operating features and conditions Miscellaneous featuresSupported Feature or condition Miscellaneous statusSAS physical interface Datum B Physical characteristics Connector requirementsPin Signal name Signal type Electrical descriptionPin descriptions SAS pin descriptionsSignal characteristics PowerSAS transmitters and receivers Ready LED OutLED drive signal Differential signalsGeneral interface characteristics Eye masks Eye masks overviewReceive eye mask X2OP 0, 5xadditional sinusoidal jitter X1OP Transmitter signal characteristics Signal characteristica Units 5Gb/s 0Gb/sReceiver signal characteristics Signal characteristic Units 5Gb/s 0Gb/sMaximum allowable jitter 5Gb/s m, n 0Gb/s m, n Deterministic jitterqReceiver jitter tolerance Impedance requirements Sheet 15Gb/sa 0Gb/sa Sinusoidal Deterministic Total JitterhImpedance requirements Sheet 2 Electrical TxRx connections= -5, 437dB Shows the zero-length test load SAS-2 Specification compliance Receiver characteristicsAdditional information Seagate Technology support services Presales SupportTechnical Support Warranty Service Data Recovery Services Authorized Service CentersData Recovery Services Call Center Toll-free Direct dial Index Page SAS See also cooling Page Seagate Technology LLC

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