Seagate ST9500430SS 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 drives.

5.1Internal drive characteristics

	ST9500430SS, ST9500431SS & ST9500432SS
Drive capacity	500	Gbytes (formatted, rounded off value)
Read/write data heads	6
Bytes per track	890,823	Bytes (average, rounded off values)
Bytes per surface	83,370	Mbytes (unformatted, rounded off value)
Tracks per surface (total)	123,148	Tracks (user accessible)
Tracks per inch	200,000	TPI (average)
Peak bits per inch	1,410,000	BPI
Areal density	283	Gbit/in2
Internal data rate	75 - 142	Mbytes/sec (variable with zone)
Disc rotation speed	7,200	rpm
Avg rotational latency	4.16	msec

5.2Seek performance characteristics

See Section 12.4.1, "SAS physical interface" on page 56 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
		(msec)		(msec)
		Read	Write	Read	Write
Average	Typical3,4	8.2	8.6	8.0	8.4
Single track	Typical3,4	0.5	0.7	0.5	0.7
Full stroke	Typical3,4	17.55	18.02	17.35	17.82

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.

10	Constellation SAS Product Manual, Rev. E

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Contents Standard Model Self-Encrypting Drive Model ST9500430SSST9500431SSST9500432SS SED Fips 140-2 ModelRevision history Contents About Fips About self-encrypting drives Defect and error managementInstallation Interface requirementsPower Constellation SAS Product Manual, Rev. E List of Figures GB model current profilesConstellation SAS Product Manual, Rev. E Seagate Technology support services Seagate Online Support and ServicesScope Electromagnetic compatibility Applicable standards and reference documentationStandards Electromagnetic susceptibilityAustralian C-Tick Electromagnetic complianceElectromagnetic compliance for the European Union Korean KCCReference documents European Union Restriction of Hazardous Substances RoHSGeneral description Standard features Media descriptionFormatted capacities PerformanceReliability Programmable drive capacityFactory-installed options Seek performance characteristics Performance characteristicsInternal drive characteristics Access timeGeneral performance characteristics Start/stop timePrefetch/multi-segmented cache control Cache operationCaching write data Prefetch operationRecoverable Errors Reliability specificationsError rates Unrecoverable ErrorsInterface errors Reliability and serviceSeek errors Preventive maintenancePerformance impact 4 S.M.A.R.TControlling S.M.A.R.T Reporting controlTemperature Log Page 0Dh Parameter Code Description Predictive failuresThermal monitor DST failure definition State of the drive prior to testingDrive Self Test DST ImplementationExtended test Function Code 010b Short and extended testsShort test Function Code 001b Log page entriesProduct warranty ShippingProduct repair and return information Physical/electrical specifications PowerChoiceTM power managementPowerChoice modes AC power requirements DC power requirementsPage General DC power requirement notes Power sequencingConducted noise immunity Current profiles GB model current profilesPower dissipation ST9500430SS, ST9500431SS and ST9500432SS in 3 Gbit operationST9500430SS, ST9500431SS and ST9500432SS in 6 Gbit operation Temperature a. Operating Environmental limitsShock and vibration Relative humidityEffective altitude sea level a. Operating ShockPage Recommended mounting Air cleanliness Vibration a. Operating-normalCorrosive environment Acoustics Mechanical specifications Mounting configuration dimensionsAbout Fips PurposeLevel 2 security About self-encrypting drives Controlled accessAdmin SP Data encryptionDrive locking Default passwordRandom number generator RNG Data bandsSupported commands Authenticated firmware downloadPower requirements Cryptographic eraseDefect and error management Drive internal defects/errorsDrive error recovery procedures SAS system errors Background Media Scan Media Pre-ScanDeferred Auto-Reallocation Idle Read After Write Installation Drive orientationCooling Air flowDrive mounting GroundingSAS features Interface requirementsDual port support Scsi commands supported Supported commandsSupported commands Supported commands Supported commands Mode Sense data Inquiry dataConstellation inquiry data Page Mode Data Header Miscellaneous operating features and conditions Miscellaneous featuresMiscellaneous status SAS physical interface Datum B Section C C Section a a Electrical description Physical characteristicsConnector requirements Pin descriptionsSAS transmitters and receivers Signal characteristicsPower Ready LED OutDifferential signals SAS-2 Specification ComplianceLED drive signal General interface characteristicsConstellation SAS Product Manual, Rev. E Index NumericsKCC Msid Mtbf See also cooling Page Constellation SAS Product Manual, Rev. E Page Seagate Technology LLC