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Seagate ST91000641SS Performance characteristics, Internal drive characteristics, Access time

Models: ST91000640SS ST91000641SS 100620418 ST91000642SS ST9500622SS ST9500621SS ST9500620SS

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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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Seagate ST91000641SS manual Performance characteristics, Internal drive characteristics, Seek performance characteristics

Contents

SED Fips 140-2 Models ST91000640SSST91000641SS ST9500620SSST9500621SSST91000642SS ST9500622SS Standard Models Self-Encrypting Drive Models Revision 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 services Scope Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibility Korean KCC Electromagnetic complianceElectromagnetic compliance for the European Union Australian C-Tick China Restriction of Hazardous Substances RoHS Directive European Union Restriction of Hazardous Substances RoHS Self-Encrypting Drives Reference Manual Reference documents General description Media description Standard features Programmable drive capacity PerformanceReliability Formatted capacities Factory-installed options Access time Performance characteristicsInternal drive characteristics Seek performance characteristics Start/stop time General performance characteristics Cache operation Prefetch/multi-segmented cache control Prefetch operation Caching write data Unrecoverable Errors Reliability specificationsError rates Recoverable Errors Preventive maintenance Reliability and serviceSeek errors Interface errors Reporting control 4 S.M.A.R.TControlling S.M.A.R.T Performance impact Predictive failures Temperature Log Page 0Dh Parameter Code DescriptionThermal monitor Implementation State of the drive prior to testingDrive Self Test DST DST failure definition Log page entries Short and extended testsShort test Function Code 001b Extended test Function Code 010b Product repair and return information Product warrantyShipping Storage PowerChoiceTM power management Physical/electrical specificationsPowerChoice modes DC power requirements AC power requirements 1000GB 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 profiles GB model current profiles 1TB model drive in 3Gb operation Power dissipation 1TB 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 Acoustics See Section Constellation.2 SAS Product Manual, Rev. H Mounting configuration dimensions Mechanical specifications Seagate Enterprise SED About FipsPurpose Validation Program Example of Fips tamper evidence labels Data encryption Controlled accessAdmin SP About self-encrypting drives Data bands Authenticated firmware downloadRandom number generator RNG Drive locking Supported commands Power requirements Drive 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 PI Identifying a Protection Information drive Drive orientation Installation Air flow Cooling Grounding Drive mounting Interface requirements SAS features Dual port support Supported commands Scsi commands supported Supported 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 description Ready LED Out Signal characteristicsPower SAS transmitters and receivers General interface characteristics SAS-2 Specification ComplianceLED drive signal Differential signals Numerics Index KCC Msid Mtbf See also cooling Page Constellation.2 SAS Product Manual, Rev. H Page Americas Seagate Technology LLC