Performance characteristics, Access time | Seagate ST373453LC

4.0Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Cheetah 15K.5 FC drives.

4.1Internal drive characteristics

	ST3300655FC	ST3146855FC	ST373455FC
Drive capacity*	300.0	146.8	73.4	Gbytes (formatted, rounded off value)
Read/write data heads	8	4	2
Bytes per track	74,340	74,340	74,340	Bytes (average, rounded off values)
Tracks per inch	125,000	125,000	125,000	TPI
Peak bits per inch	890k	890k	890k	BPI
Areal density	110	110	110	Gbits/inch2
Internal data rate	960 to 1607	960 to 1607	960 to 1607	Mbits/sec (variable with zone)
Disc 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 performance characteristics

See Section 9.5, "FC-AL physical interface" on page 64 and the Fibre Channel Interface Manual (part number 77767496) for additional timing details.

4.2.1Access time

Not including controller overhead1,2(msec)

		Read	Write
Average	Typical	3.5	4.0
Single track	Typical	0.2	0.4
Full stroke	Typical	6.8	7.5

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.5 FC Product Manual, Rev. F

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Seagate ST373453LC manual Performance characteristics, Internal drive characteristics, Seek performance characteristics

Contents

ST3300655FC ST3146855FC ST373455FC Cheetah 15K.5 FCPage Contents Installation Defect and error managementInterface requirements Seagate Technology support services Cheetah 15K.5 FC Product Manual, Rev. F List of Figures Page Scope Cheetah 15K.5 FC Product Manual, Rev. F Electromagnetic susceptibility Applicable standards and reference documentationStandards Electromagnetic compatibility European Union Restriction of Hazardous Substances RoHS Ncits TR-20 Reference documents Cheetah 15K.5 FC Product Manual, Rev. F General description Media description Standard features Programmable drive capacity PerformanceReliability Formatted capacities Factory-installed options Factory-installed accessoriesUser-installed accessories Access time Performance characteristicsInternal drive characteristics Seek performance characteristics Prefetch/multi-segmented cache control Format command execution time minutesGeneral performance characteristics Start/stop time Caching write data Cache operation Prefetch operation 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 State of the drive prior to testingParameter Code Description 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 Cheetah 15K.5 FC Product Manual, Rev. F DC power requirements for ST3300655FC model Gbit Amps Physical/electrical specificationsAC power requirements DC power requirements DC power requirements for ST373455FC model Gbit Amps DC power requirements for ST3146855FC model Gbit Amps Current profiles General DC power requirement notesPower sequencing Conducted noise immunity Typical ST3300655FC drive, 4 Gbit, +12V current profile Typical ST3146855FC drive, 4 Gbit, +12V current profile Typical ST373455FC drive, 4 Gbit, +12V current profile ST3300655FC Power dissipation ST3146855FC ST3146855FC CURRENT/POWER vs Throughput FC 4GB ST373455FC TemperatureST373455FC CURRENT/POWER vs Throughput FC 4GB Environmental limits Shock Relative humidityEffective altitude sea level Shock and vibration Package size Packaged/product weight Drop height Recommended mounting Corrosive environment Air cleanlinessVibration Acoustics RoHS compliance statement Mounting configuration dimensions Mechanical specifications Cheetah 15K.5 FC Product Manual, Rev. F Drive internal defects/errors Defect and error managementDrive error recovery procedures Page Background Media Scan FC-AL system errors Deferred Auto-Reallocation Media Pre-ScanIdle Read After Write Cooling InstallationDrive ID/option selection Drive orientation Air flow Drive mounting Grounding Cheetah 15K.5 FC Product Manual, Rev. F Interface requirements FC-AL featuresFibre Channel link service frames Link services supported Type of frame Fibre Channel task management responses Fibre Channel task management functionsFC Scsi FCP response codes Function name Response code NPort login Plogi payload Bytes Fibre Channel port login Process Login Plri payload Fibre Channel port login acceptFibre Channel Process Login NPort Login Accept ACC payload Bytes Fabric Login Flogi payload Bytes Fibre Channel Process Login AcceptFibre Channel fabric login Process Login Accept ACC payload Bytes Fabric Login Accept ACC payload Bytes Fibre Channel fabric accept login Option Supported Dual port supportFibre Channel Arbitrated Loop options FC-AL options supported Supported commands Command code Command name Scsi commands supported Verify error recovery page 07h Cheetah 15K.5 FC Product Manual, Rev. F Temperature page 0Dh Inquiry data Mode Sense dataCheetah 15K.5 FC inquiry data Bytes Data hex Page Mmode Sense 10 Byte Header Data Mode Sense 10 Byte Header Data 00 ae 00 10 00 00 00 08 08 8b b9 98 00 00 02 Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features Supported Feature or condition FC-AL physical interface Physical characteristicsPhysical description Electrical description Connector requirementsPin descriptions Pin Signal name Signal type FC-SCA pin descriptions Pin Signal name Signal typeFC-AL transmitters and receivers Fault LED Out Power Active LED Out Enable port bypass signalsMotor start controls 11 SEL6 through SEL0 ID lines Parallel Enclosure Services Interface ESI Arbitrated loop physical address Alpa values SettingHex Dec TTL input characteristics Signal characteristicsDevice control codes FC Differential output LED driver signalsFC Differential input Receive eye diagram Eye diagram data values Link rate GHz Cheetah 15K.5 FC Product Manual, Rev. F Technical Support Seagate Technology support servicesInternet Presales Support Data Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Numerics Index FAN Flogi Plogi Page See also cooling