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Seagate ST3450857SS manual Performance characteristics, Internal drive characteristics, Seek time

Models: ST3450857SS ST3300557SS ST3600057SS ST3600957SS ST3450757SS ST3300657SS

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4.0Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Cheetah 15K.7 drives.

4.1Internal drive characteristics

	ST3600057SS	ST3450857SS	ST3300657SS
	ST3600957SS	ST3450757SS	ST3300557SS
Drive capacity	600	450	300	Gbytes (formatted, rounded off value)*
Read/write data heads	8	6	4
Tracks per inch	165,000	165,000	165,000	TPI
Peak bits per inch	1,361	1,361	1,361	KBPI
Areal Density	225	225	225	Gbits/inch2
Internal data rate	1.49 - 2.37	1.49 - 2.37	1.49 - 2.37	Gbits/sec (max)
Disk rotation speed	15k	15k	15k	RPM
Avg rotational latency	2.0	2.0	2.0	msec

*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment and formatting.

4.2Seek time

See Section 10.4.1, "SAS physical interface" on page 56 and the SAS Interface Manual (part number 100293071) for additional timing details.

4.2.1Access time

Not Including controller overhead1, 2 (msec)

		Read	Write
Average	Typical	3.4	3.9
Single track	Typical	0.2	0.44
Full stroke	Typical	6.6	7.4

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 15K.7 SAS Product Manual, Rev. A

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Seagate ST3450857SS, ST3300657SS manual Performance characteristics, Internal drive characteristics, Seek time, Access time

Contents

Cheetah 15K.7 SAS Standard models Self-Encrypting Drive modelsPage Contents About self-encrypting drives Defect and error managementInstallation Interface requirements Seagate Technology support services Cheetah 15K.7 SAS Product Manual, Rev. a Scope Model Number Capacity Self-Encrypting Drive SED Electromagnetic compatibility Standards, compliance and reference documentsStandards Electromagnetic susceptibility Compliance European Union Restriction of Hazardous Substances RoHS Reference documents General description Performance Standard featuresMedia description Formatted capacities Factory-installed optionsReliability Programmable drive capacity Access time Performance characteristicsInternal drive characteristics Seek time Start/stop time Format command execution time minutesGeneral performance characteristics Prefetch/multi-segmented cache control Cache operation Caching write data Prefetch operation Recoverable Errors Reliability specificationsError rates Unrecoverable Errors Interface errors Reliability and serviceSeek errors Preventive maintenance Performance impact 4 S.M.A.R.TControlling S.M.A.R.T Milliseconds Predictive failures Reporting controlDetermining rate Thermal monitor Drive Self Test DST Temperature Log Page 0Dh Parameter Code DescriptionState of the drive prior to testing DST failure definition Short test Function Code 001b Invoking DSTShort and extended tests Extended test Function Code 010b Shipping Product warrantyAbort Product repair and return information DC power requirements Physical/electrical specificationsAC power requirements 600 GB DC power requirements ST3600057SS ST3600957SS Gbit mode Amps 450 GB DC power requirements ST3450857SS ST3450757SS Gbit mode Amps 300 GB DC power requirements ST3300657SS ST3300557SS Gbit mode Amps Current profiles Power sequencingConducted noise immunity Typical 600GB current profiles Typical 300GB current profiles Power dissipation ST3600057SS model ST3450857SS model ST3300657SS model TemperatureEnvironmental limits Shock and vibration Relative humidityEffective altitude sea level Shock Package size Packaged/product weight Drop height Vibration Recommended mounting Corrosive environment Air cleanlinessAcoustics RoHS compliance statement Mechanical specifications Physical dimensions About self-encrypting drives Controlled accessAdmin SP Data encryption Drive locking Authenticated firmware downloadRandom number generator RNG Data bands Power requirements Supported commands Drive error recovery procedures Defect and error managementDrive internal defects/errors Page SAS system errors Background Media Scan Idle Read After Write Media Pre-ScanDeferred Auto-Reallocation Cooling InstallationDrive orientation Drive mounting Grounding SAS features Interface requirements Command name Command code Supported Scsi commands supportedCommands supported by Cheetah 15K.6 SAS family drives Dual port support Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Inquiry data Cheetah 15K.7 inquiry data Bytes Data hex Mode Sense data 10.3.2.1 ST3600057SS and ST3600957SS Mode Sense data Mode Pages DEF CHG 10.3.2.2 ST3450857SS and ST3450757SS Mode Sense data Mode Data Header Block Descriptor Mode Pages DEF CHG Read Capacity Data Buffer C D E F 10.3.2.3 ST3300657SS and ST3300557SS Mode Sense data Mode Pages Supported Feature or condition Miscellaneous operating features and conditionsMiscellaneous features Miscellaneous status SAS physical interface Physical interface Datum B Physical characteristics Connector requirements Pin descriptions Pin Signal name Signal typeElectrical description SAS pin descriptions SAS transmitters and receivers Signal characteristicsPower Ready LED Out Differential signals SAS-2 Specification complianceLED drive signal General interface characteristics Technical Support Seagate Technology support servicesPresales Support Data Recovery Services Call CenterToll-freeDirect dialFAX Warranty ServiceData Recovery Services Authorized Service Centers Cheetah 15K.7 SAS Product Manual, Rev. a Index NumericsPage SAS Smart