Seagate ST35000415SS Performance characteristics, Internal drive characteristics, Access time

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4.0Performance characteristics

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

4.1Internal drive characteristics

	ST32000444SS	ST31000424SS	ST3500414SS
	ST32000445SS	ST31000425SS	ST3500415SS
Drive capacity	2000	1000	500	GB (formatted, rounded off value)
Read/write data heads	8	4	2
Bytes per track	1,012,608	1,012,608	1,012,608	Bytes (average, rounded off values)
Bytes per surface	250,000	250,000	250,000	MB (unformatted, rounded off value)
Tracks per surface (total)	248,600	248,600	248,600	Tracks (user accessible)
Tracks per inch	237,000	237,000	237,000	TPI (average)
Peak bits per inch	1,515,000	1,515,000	1,515,000	BPI
Areal density	347	347	347	Gb/in2
Internal data rate	95 - 212	95 - 212	95 - 212	MB/s (variable with zone)
Disc rotation speed	7200	7200	7200	rpm
Avg rotational latency	4.16	4.16	4.16	ms

4.2Seek performance characteristics

See Section 10.4.1, "SAS physical interface" on page 63 and the SAS Interface Manual (part number 100293071) for additional timing details.

4.2.1Access time

		Not including controller overhead1, 2 (ms)		Including controller overhead1, 2 (ms)
		Read	Write	Read	Write
Average	Typical3,4	8.3	9.3	8.5	9.5
Single track	Typical3,4	0.5	0.8	0.7	1.0
Full stroke	Typical3,4	18	19	18.2	19.2

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.

ConstellationES Series SAS Product Manual, Rev. D

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Contents ST32000445SS ST31000425SS ST3500415SS ST32000444SS ST31000424SS ST3500414SSStandard Models Self-Encrypting Drive ModelsRevision history Contents Installation Defect and error managementAbout self-encrypting drives Interface requirementsSeagate Technology support services ConstellationES Series SAS Product Manual, Rev. D ST32000444SS & ST32000445SS model current profiles List of FiguresConstellationES Series SAS Product Manual, Rev. D Scope Standards Applicable standards and reference documentationElectromagnetic compatibility Electromagnetic susceptibilityElectromagnetic compliance for the European Union Electromagnetic complianceAustralian C-Tick Korean KCCEuropean Union Restriction of Hazardous Substances RoHS Reference documentsGeneral description Media description Standard featuresReliability PerformanceFormatted capacities Programmable drive capacityFactory-installed options Internal drive characteristics Performance characteristicsSeek performance characteristics Access timeStart/stop time General performance characteristicsCache operation Prefetch/multi-segmented cache controlPrefetch operation Caching write dataError rates Reliability specificationsRecoverable Errors Unrecoverable ErrorsSeek errors Reliability and serviceInterface errors Preventive maintenanceControlling S.M.A.R.T 4 S.M.A.R.TPerformance impact Reporting controlThermal monitor Temperature Log Page 0Dh Parameter Code DescriptionPredictive failures Drive Self Test DST State of the drive prior to testingDST failure definition ImplementationShort test Function Code 001b Short and extended testsExtended test Function Code 010b Log page entriesProduct repair and return information Product warrantyShipping PowerChoice modes Physical/electrical specificationsPowerChoiceTM power management DC power requirements AC power requirementsConstellationES Series SAS Product Manual, Rev. D ConstellationES Series SAS Product Manual, Rev. D Page Conducted noise immunity General DC power requirement notesPower sequencing ST32000444SS & ST32000445SS model current profiles Current profilesST31000424SS & ST31000425SS model current profiles ST3500414SS & ST3500415SS model current profiles ST32000444SS and ST32000445SS in 3Gb operation Power dissipationST32000444SS and ST32000445SS in 6Gb operation ST31000424SS and ST31000425SS in 3Gb operation ST31000424SS and ST31000425SS in 6Gb operation Os per Second ST3500414SS CURRENT/POWER vs Throughput SAS 3.0GBST3500414SS and ST3500415SS in 3Gb operation ST3500414SS and ST3500415SS in 6Gb operation Relative humidity Temperature a. OperatingEnvironmental limits Shock Effective altitude sea level a. OperatingShock and vibration Recommended mounting Vibration a. Operating-normal Air cleanlinessAcoustics Corrosive environmentElectromagnetic susceptibility Mounting configuration dimensions Mechanical specificationsAdmin SP Controlled accessAbout self-encrypting drives Data encryptionRandom number generator RNG Default passwordDrive locking Data bandsPower requirements Authenticated firmware downloadSupported commands Cryptographic eraseDrive error recovery procedures Defect and error managementDrive internal defects/errors SAS system errors Deferred Auto-Reallocation Background Media ScanMedia Pre-Scan Idle Read After Write Drive orientation InstallationAir flow CoolingGrounding Drive mountingInterface requirements SAS featuresDual port support Supported commands Scsi commands supportedSupported commands Supported commands Supported commands Constellation ES inquiry data Mode Sense dataInquiry data Page Mode Data Header 74 70 6d b0 00 00 02 3a 38 60 30 00 00 02 Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features SAS physical interface Datum B Section C C Section a a Connector requirements Physical characteristicsElectrical description Pin descriptionsPower Signal characteristicsSAS transmitters and receivers Ready LED OutLED drive signal SAS-2 Specification ComplianceDifferential signals General interface characteristicsWarranty Support Direct.seagate.com Spp.seagate.com Seagate Technology support servicesWeb Presales SupportData Recovery Services Authorized Service Centers Technical Support Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Presales SupportNumerics IndexKCC Msid Mtbf See also cooling Page ConstellationES Series SAS Product Manual, Rev. D Page Seagate Technology LLC