Seagate ST9300553SS Performance characteristics, Internal drive characteristics, Access time

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5.0Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Sav- vio drives.

5.1Internal drive characteristics

	ST9300653SS	ST9146853SS
	ST9300553SS	ST9146753SS
	ST9300453SS	ST9146653SS
Drive capacity	300	146	GB (formatted, rounded off value)
Read/write data heads	4	2
Tracks per surface (total)	107,400	107,400	Tracks (user accessible including spare tracks)
Tracks per in	273,000	273,000	KTPI (average)
Peak bits per in	1601	1601	KBPI
Areal density	448	448	Gb/in2
Internal data rate	1554 - 2267	1554 - 2267	Mb/s (variable with zone)
Disk rotation speed	15K	15K	RPM
Avg rotational latency	2.0	2.0	ms

5.2Seek performance characteristics

See Section 12.4.1, "SAS physical interface" on page 57 and the SAS Interface Manual (part number 100293071) for additional timing details.

5.2.1Access time

		Including controller overhead1, 2 (ms)		Not including controller overhead1, 2 (ms)
		Read	Write	Read	Write
Average	Typical3,4	2.9	3.3	2.7	3.1
Single track	Typical3,4	0.4	0.6	0.2	0.4
Full stroke	Typical3,4	5.3	5.7	5.1	5.5

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.

Savvio 15K.3 SAS Product Manual, Rev. A

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Contents SED FIPS140-2 Models ST9300653SSST9300553SS ST9146853SSST9146753SSST9300453SS ST9146653SS Standard Models Self-Encrypting Drive ModelsPage Contents Interface requirements Defect and error managementInstallation About Fips About self-encrypting drivesPage Savvio 15K.3 SAS Product Manual, Rev. a List of Figures Page Seagate Online Support and Services Seagate Technology support servicesScope Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibilityKorean KCC Electromagnetic complianceElectromagnetic compliance for the European Union Australian C-TickEuropean Union Restriction of Hazardous Substances RoHS Reference documents Scsi Commands Reference Manual SAS Interface ManualGeneral description Media description Standard featuresReliability PerformanceFormatted capacities Programmable drive capacity Factory installed optionsAccess time Performance characteristicsInternal drive characteristics Seek performance characteristicsGeneral performance characteristics Format command execution timeStart/stop time Cache operation Prefetch/multi-segmented cache controlPrefetch operation Caching write dataUnrecoverable Errors Reliability specificationsError rates Recoverable ErrorsPreventive maintenance Reliability and serviceSeek errors Interface errorsPerformance impact Maximum processing delay4 S.M.A.R.T Controlling S.M.A.R.TPredictive failures Temperature Log Page 0Dh Parameter Code DescriptionThermal monitor Implementation State of the drive prior to testingDrive Self Test DST DST failure definitionLog page entries Short and extended testsShort test Function Code 001b Extended test Function Code 010bStorage Product warrantyShipping Product repair and return informationPowerChoiceTM power management Physical/electrical specificationsPowerChoice modes DC power requirements AC power requirementsRegulation 300GB models DC power requirements146GB models DC power requirements Power sequencing General DC power requirement notesConducted noise immunity Current profile for 300GB models Current profilesCurrent profile for 146GB models 300GB models in 6Gb operation Power dissipation300GB models in 3Gb operation 146GB models in 3Gb operation 146GB models in 6Gb operationEnvironmental limits Temperature a. OperatingRelative humidity Shock and vibration Effective altitude sea level a. OperatingShock Recommended mounting Vibration a. Operating-normalCorrosive environment Air cleanlinessAcoustics Dimensions Mechanical specificationsPurpose About FipsLevel 2 security Data encryption Controlled accessAdmin SP About self-encrypting drivesData bands Default passwordRandom number generator RNG Drive lockingCryptographic erase Authenticated firmware downloadPower requirements Supported commandsDrive internal defects/errors Defect and error managementDrive error recovery procedures Background Media Scan SAS system errorsDeferred Auto-Reallocation Media Pre-ScanIdle Read After Write Identifying a Protection Information drive Setting and determining the current Type LevelProtection Information PI Levels of PIDrive orientation InstallationAir flow CoolingGrounding Drive mountingInterface requirements SAS featuresSupported commands Scsi commands supportedDual port support Supported commands Supported commands Supported commands Inquiry data Mode Sense dataSavvio inquiry data Page Mode Data Header Mode Data Header 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 descriptionReady LED Out Signal characteristicsPower SAS transmitters and receiversGeneral interface characteristics SAS-2 Specification complianceLED drive signal Differential signalsNumerics IndexPage Msid Mtbf See also cooling Page Savvio 15K.3 SAS Product Manual, Rev. a