Seagate ST936751FC manual 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 Sav- vio drives.

4.1Internal drive characteristics

	ST973451FC	ST936751FC
Drive capacity	73.4	36.2	Gbytes (formatted, rounded off value)
Read/write data heads	4	2
Tracks per surface (total)	42,554	42,554	Tracks (user accessible)
Tracks per inch	150	150	kTPI (average)
Peak bits per inch	861.81	861.81	kBPI
Areal Density	130.58	130.58	Gbit/in2
Internal data rate	957.51 to 1,282.08	957.51 to 1,282.08	Mbits/sec (variable with zone)
Sustained data transer rate	57-89	57-89	Mbytes/sec (variable with zone)
Disc rotation speed	15k	15k	revolutions/min (RPM)
Avg rotational latency	2.0	2.0	msec

4.2Seek performance characteristics

See Section 9.5, "FC-AL physical interface" on page 57 and the Fibre Channel Interface Manual (part number 100293070) for additional timing details.

4.2.1Access time

Not Including controller overhead1, 2 (msec)

		Read	Write
Average	Typical3,4	2.6	3.1
Single track	Typical3,4	0.2	0.4
Full stroke	Typical3,4	4.9	5.5

1.Execution time measured from receipt of the FCP Command to the FCP Response.

2.Assumes no errors and no sector has been relocated.

3.Typical access times are measured under nominal conditions of temperature, volt- age, and horizontal orientation as measured on a representative sample of drives.

4.Access to data = access time + latency time.

Savvio 15K.1 FC Product Manual, Rev. B

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Contents ST973451FC ST936751FC Savvio 15K.1 FCPage Contents Interface requirements Physical/electrical specificationsDefect and error management InstallationSeagate Technology support services Savvio 15K.1 FC Product Manual, Rev. B List of Figures Page Savvio 15K.1 family disc drive ScopeSavvio 15K.1 FC Product Manual, Rev. B Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibilityEuropean Union Restriction of Hazardous Substances RoHS Ncits TR-19 Reference documentsSavvio 15K.1 FC Product Manual, Rev. B General description Standard features Formatted capacities Media descriptionPerformance ReliabilityOptions Factory-installed accessoriesProgrammable drive capacity Access time Performance characteristicsInternal drive characteristics Seek performance characteristicsGeneral performance characteristics Format command execution timeStart/stop time Cache operation Prefetch/multi-segmented cache controlCaching write data Prefetch operation Error rates Reliability specificationsRecoverable Errors Interface errors Reliability and serviceUnrecoverable Errors Seek errors4 S.M.A.R.T Hot plugging the driveControlling S.M.A.R.T Predictive failures Performance impactReporting control Determining rateDST failure definition Temperature Log Page 0DhParameter Code Description Drive Self Test DSTShort and extended tests State of the drive prior to testingImplementation Invoking DSTShipping Product warrantyLog page entries AbortProduct repair and return information AC power requirements Physical/electrical specificationsDC power requirements General DC power requirement notes +5V +12V Power sequencingConducted noise immunity Current profilesTypical ST936751FC drive +12V and +5V current profiles CURRENT/POWER vs Throughput FC 1GB Random 8 Block Reads Power dissipationST973451FC CURRENT/POWER vs Throughput FC 4GB Random 8 Block Reads ST936751FC FC CURRENT/POWER vs Throughput FC 1GB Random 8 Block ReadsFC CURRENT/POWER vs Throughput FC 4GB Random 8 Block Reads TemperatureEnvironmental limits Shock Relative humidityEffective altitude sea level Shock and vibrationPackage size Packaged/product weight Drop height Recommended mounting Vibration Air cleanlinessCorrosive environment Acoustics Drive dimensions inches Mechanical specificationsDrive internal defects/errors Defect and error managementDrive error recovery procedures FC-AL system errors Media Pre-Scan Background Media ScanDeferred Auto-Reallocation Idle Read After Write Drive orientation InstallationCooling Grounding Drive mountingInterface requirements FC-AL featuresFibre Channel link service frames Link services supported Type of frameTask name Supported Fibre Channel task management functionsFibre Channel task management responses Fibre Channel Scsi FCP task management functionsNPort login Plogi payload Bytes Fibre Channel port loginProcess Login Plri payload Fibre Channel port login acceptFibre Channel Process Login NPort Login Accept ACC payload BytesFabric Login Flogi payload Bytes Fibre Channel Process Login AcceptFibre Channel fabric login Process Login Accept ACC payload BytesFabric Login Accept ACC payload Bytes Fibre Channel fabric accept loginOption Supported Dual port supportFibre Channel Arbitrated Loop options FC-AL options supportedSupported commands Command code Command name Scsi commands supportedDisconnect/reconnect control page 02h Savvio 15K.1 FC Product Manual, Rev. B LBdata Supported commands Command code Supported 4 Command name Savvio inquiry data Bytes Data hex Inquiry dataMiscellaneous status Miscellaneous operating features and conditionsMiscellaneous features Supported Feature or conditionFC-AL physical interface Physical characteristicsPhysical description Part description Positions Part number Features Connector requirementsElectrical description Pin Signal name Signal type FC-SCA pin descriptions Pin Signal name Signal typePin descriptions Fault LED Out PowerFC-AL transmitters and receivers Active LED Out Enable port bypass signalsMotor start controls 11 SEL6 through SEL0 ID lines Parallel Enclosure Services Interface ESIArbitrated loop physical address Alpa values SettingHex Dec TTL input characteristics Signal characteristicsDevice control codes Differential Pecl input Differential Pecl outputSavvio 15K.1 FC Product Manual, Rev. B Technical Support Seagate Technology support servicesInternet Presales SupportData Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Numerics IndexFAN Page Plogi SEL ID See also cooling