Seagate ST91000641SS Performance characteristics, Internal drive characteristics, Access time

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5.0Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Con- stellation.2 drives.

5.1Internal drive characteristics

ST91000640SS ST9500620SS

ST91000641SS ST9500621SS

ST91000642SS ST9500622SS

Drive capacity	1000	500	Gbytes (formatted, rounded off value)
Read/write data heads	8	4
Bytes per track	732,998	732,998	Bytes (average, rounded off values)
Bytes per surface	125,069	125,069	MB (unformatted, rounded off value)
Tracks per surface (total)	165,800	165,800	Tracks (user accessible)
Tracks per inch	270,000	270,000	TPI (average)
Peak bits per inch	1,544,000	1,544,000	BPI
Areal density	417	417	Gb/in2
Internal data rate	84 - 163	84 - 163	MB/s (variable with zone)
Disk rotation speed	7200	7200	rpm
Avg rotational latency	4.16	4.16	ms

5.2Seek performance characteristics

See Section 12.4.1, "SAS physical interface" on page 63 and the SAS Interface Manual (part number 100293071) for additional timing details.

5.2.1Access time

		Including controller overhead1, 2		Not including controller overhead1, 2
		(ms)		(ms)
		Read	Write	Read	Write
Average	Typical3,4	7.7	8.7	7.5	8.5
Single track	Typical3,4	0.23	0.44	0.23	0.44
Full stroke	Typical3,4	17.26	18.28	17.06	18.08

1.Execution time measured from receipt of the Command to the Response.

2.Assumes no errors and no sector has been relocated.

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

4.Access time = controller overhead + average seek time and applies to all data transfer commands. Access to data = access time + latency time.

Constellation.2 SAS Product Manual, Rev. H

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Contents SED Fips 140-2 Models ST91000640SSST91000641SS ST9500620SSST9500621SSST91000642SS ST9500622SS Standard Models Self-Encrypting Drive ModelsRevision history Contents Interface requirements Defect and error managementInstallation About Fips About self-encrypting drivesPage Constellation.2 SAS Product Manual, Rev. H List of Figures Constellation.2 SAS Product Manual, Rev. H Seagate Online Support and Services Seagate Technology support servicesScope Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibilityKorean KCC Electromagnetic complianceElectromagnetic compliance for the European Union Australian C-TickChina Restriction of Hazardous Substances RoHS Directive European Union Restriction of Hazardous Substances RoHSSelf-Encrypting Drives Reference Manual Reference documentsGeneral description Media description Standard featuresProgrammable drive capacity PerformanceReliability Formatted capacitiesFactory-installed options Access time Performance characteristicsInternal drive characteristics Seek performance characteristicsStart/stop time General performance characteristicsCache operation Prefetch/multi-segmented cache controlPrefetch 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 impactPredictive failures Temperature Log Page 0Dh Parameter Code DescriptionThermal monitor Implementation State of the drive prior to testingDrive Self Test DST DST failure definitionLog page entries Short and extended testsShort test Function Code 001b Extended test Function Code 010bProduct repair and return information Product warrantyShipping StoragePowerChoiceTM power management Physical/electrical specificationsPowerChoice modes DC power requirements AC power requirements1000GB drive Standard & SED model DC power requirements 500GB drive Standard & SED model DC power requirements Power sequencing General DC power requirement notesConducted noise immunity TB model current profiles Current profilesGB model current profiles 1TB model drive in 3Gb operation Power dissipation1TB model drive in 6Gb operation 500GB model drive in 3Gb operation 500GB model drive in 6Gb operation Environmental limits Temperature a. OperatingRelative humidity Shock and vibration Effective altitude sea level a. OperatingShock Recommended mounting Corrosive environment Air cleanlinessVibration a. Operating-normal AcousticsSee Section Constellation.2 SAS Product Manual, Rev. H Mounting configuration dimensions Mechanical specificationsSeagate Enterprise SED About FipsPurpose Validation ProgramExample of Fips tamper evidence labels Data encryption Controlled accessAdmin SP About self-encrypting drivesData bands Authenticated firmware downloadRandom number generator RNG Drive lockingSupported commands Power requirementsDrive internal defects/errors Defect and error managementDrive error recovery procedures SAS system errors Media Pre-Scan Background Media ScanDeferred Auto-Reallocation Levels of PI Setting and determining the current Type LevelIdle Read After Write Protection Information PIIdentifying a Protection Information drive Drive orientation InstallationAir flow CoolingGrounding Drive mountingInterface requirements SAS featuresDual port support Supported commands Scsi commands supportedSupported commands Supported commands Supported commands Inquiry data Mode Sense dataConstellation.2 inquiry data Page Block Descriptor 00 00 00 00 3a 38 60 30 00 00 00 00 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 descriptionReady LED Out Signal characteristicsPower SAS transmitters and receiversGeneral interface characteristics SAS-2 Specification ComplianceLED drive signal Differential signalsNumerics IndexKCC Msid Mtbf See also cooling Page Constellation.2 SAS Product Manual, Rev. H Page Americas Seagate Technology LLC