Performance characteristics, Seek time | Seagate ST3300457SS

5.0Performance characteristics

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

5.1Internal drive characteristics

	ST3600057SS	ST3450857SS	ST3300657SS
	ST3600957SS	ST3450757SS	ST3300557SS
	ST3600857SS	ST3450657SS	ST3300457SS
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.

5.2Seek time

See Section 12.4.1, "SAS physical interface" on page 58 and the SAS Interface Manual (part number 100293071) for additional timing details.

5.2.1Access 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.

Cheetah 15K.7 SAS Product Manual, Rev. D

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Seagate ST3300457SS, ST3450657SS manual Performance characteristics, Internal drive characteristics, Seek time, Access time

Contents

Standard models Self-Encrypting Drive models ST3600857SSST3450657SS ST3300457SSPage Contents Interface requirements Defect and error managementInstallation About Fips About self-encrypting drives Power Cheetah 15K.7 SAS Product Manual, Rev. D Seagate Online Support and Services Seagate Technology support services Scope Electromagnetic susceptibility Standards, compliance and reference documentsStandards Electromagnetic compatibility European Union Restriction of Hazardous Substances RoHS Compliance Reference documents General description Standard features Media descriptionPerformance Programmable drive capacity Factory-installed optionsReliability Formatted capacities Seek time Performance characteristicsInternal drive characteristics Access time Format command execution time minutes General performance characteristicsStart/stop time 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 Milliseconds 4 S.M.A.R.TControlling S.M.A.R.T Performance impact Thermal monitor Reporting controlDetermining rate Predictive failures DST failure definition Temperature Log Page 0Dh Parameter Code DescriptionState of the drive prior to testing Drive Self Test DST Extended test Function Code 010b Invoking DSTShort and extended tests Short test Function Code 001b Product repair and return information Product warrantyAbort Shipping Physical/electrical specifications AC power requirementsDC power requirements Gbit mode Amps 600 GB DC power requirements 450 GB DC power requirements 300 GB DC power requirements Power sequencing Conducted noise immunityCurrent profiles Typical 600GB current profiles Typical 300GB current profiles Power dissipation 450GB model Environmental limits Temperature a. Operating Shock Relative humidityEffective altitude sea level a. Operating Shock and vibration Package size Packaged/product weight Drop height Recommended mounting Vibration a. Operating-normal RoHS compliance statement Air cleanlinessAcoustics Corrosive environment Units of Measure mm inches Mechanical specifications About Fips PurposeLevel 2 security Data encryption Controlled accessAdmin SP About self-encrypting drives Data bands Authenticated firmware downloadRandom number generator RNG Drive locking Supported commands Power requirements Defect and error management Drive internal defects/errorsDrive error recovery procedures Page Background Media Scan SAS system errors Media Pre-Scan Deferred Auto-ReallocationIdle Read After Write Installation Drive orientationCooling Grounding Drive mounting Interface requirements SAS features Scsi commands supported Commands supported by Cheetah 15K.6 SAS family drivesDual 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 Cheetah 15K.7 inquiry data Bytes Data hex Inquiry data Mode Sense data Mode Pages 12.3.2.1 600GBmodel Mode Sense data DEF CHG Mode Data Header Block Descriptor Mode Pages 12.3.2.2 450GB model Mode Sense data DEF CHG Read Capacity Data Buffer C D E F Mode Pages 12.3.2.3 300GB model Mode Sense data Miscellaneous features Miscellaneous operating features and conditions SAS physical interface Miscellaneous status Datum B Connector requirements Physical characteristics Electrical description Pin descriptionsSAS pin descriptions Ready LED Out Signal characteristicsPower SAS transmitters and receivers General interface characteristics SAS-2 Specification complianceLED drive signal Differential signals Cheetah 15K.7 SAS Product Manual, Rev. D Numerics IndexPage SAS Smart