Seagate ST336854FC manual Performance characteristics, Internal drive characteristics, Access time

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4.0Performance characteristics

4.0Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Cheetah 15K.4 FC drives.

4.1Internal drive characteristics

	ST3146954FC	ST373554FC	ST336854FC
Drive capacity	146.8	73.4	36.7	Gbytes (formatted, rounded off value)
Read/write data heads	8	4	2
Bytes per track	471,916	471,916	471,916	Bytes (average, rounded off values)
Bytes per surface	18,351	18,351	18,351	Mbytes (unformatted, rounded off value)
Tracks per surface (total)	50,864	50,864	50,864	Tracks (user accessible)
Tracks per inch	85,000	85,000	85,000	TPI
Peak bits per inch	628	628	628	KBPI
Internal data rate	685-1,142	685-1,142	685-1,142	Mbits/sec (variable with zone)
Disc rotation speed	15k	15k	15k	rpm
Avg rotational latency	2.0	2.0	2.0	msec

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	0.27	0.45
Full stroke	Typical	7.4	7.9

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.4 FC Product Manual, Rev. B

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Contents ST3146954FC ST373554FC ST336854FC Cheetah 15K.4 FCPage ST3146954FC ST373554FC ST336854FC March Rev. B Draft Revision status summary sheetRev. A 07/15/05Page 6.0 Physical/electrical specifications Contents4.0 Performance characteristics 5.0 Reliability specifications9.0 Interface requirements 7.0 Defect and error management8.0 Installation 10.0 Seagate Technology support services Cheetah 15K.4 FC Product Manual, Rev. B List of Figures Page Figure 1. Cheetah 15K.4 FC family disc drive 1.0 ScopeCheetah 15K.4 FC Product Manual, Rev. B 2.1.1.1 Electromagnetic susceptibility 2.0 Applicable standards and reference documentation2.1 Standards 2.1.1 Electromagnetic compatibilityKorean MIC 2.1.2 Electromagnetic complianceElectromagnetic compliance for the European Union Australian C-TickFibre Channel Interface Manual Specification for Acoustic Test Requirement and Procedures2.2 Reference documents Cheetah 15K.4 FC Product Manual, Rev. B 3.0 General description 3.2 Media description 3.1 Standard features3.5.1 Programmable drive capacity 3.3 Performance3.4 Reliability 3.5 Formatted capacities3.8 User-installed accessories 3.6 Factory-installed accessories3.7 Factory-installed options 4.2.1 Access time 4.0 Performance characteristics4.1 Internal drive characteristics 4.2 Seek performance characteristics4.4 Prefetch/multi-segmented cache control 4.2.2 Format command execution time minutesGeneral performance characteristics 4.3 Start/stop time4.5 Cache operation 4.5.2 Prefetch operation 4.5.1 Caching write dataCheetah 15K.4 FC Product Manual, Rev. B Cheetah 15K.4 FC Product Manual, Rev. B 5.1.2 Unrecoverable Errors 5.0 Reliability specifications5.1 Error rates 5.1.1 Recoverable Errors5.2.2 Preventive maintenance 5.2 Reliability and service5.1.3 Seek errors 5.1.4 Interface errorsControlling S.M.A.R.T 5.2.3 Hot plugging the drive5.2.4 S.M.A.R.T On-line only delay Fully-enabled delayPerformance impact Maximum processing delay5.2.6.1 DST failure definition Parameter CodeDescription 5.2.6 Drive Self Test DST5.2.6.2.3 Short and extended tests 5.2.6.2.1 State of the drive prior to testing5.2.6.2 Implementation 5.2.6.2.2 Invoking DSTShipping 5.2.7 Product warranty5.2.6.2.4 Log page entries 5.2.6.2.5 AbortProduct repair and return information 6.2 DC power requirements 6.0 Physical/electrical specifications6.1 AC power requirements 3 See +12V current profile in Figure 6.2.3 Current profiles General DC power requirement notes6.2.2 Power sequencing 6.2.1 Conducted noise immunityFigure 3. Typical ST3146954FC drive, 2 Gbit, +5V current profile Figure 2. Typical ST3146954FC drive, 2 Gbit, +12V current profileFigure 5. Typical ST373554FC drive +5V current profile Figure 4. Typical ST373554FC drive +12V current profileFigure 7. Typical ST336854FC drive +5V current profile Figure 6. Typical ST336854FC drive +12V current profileST3146954FC 6.3 Power dissipationPower watts ST373554FCST336854FC 6.4.2 Relative humidity 6.4 Environmental limits6.4.1 Temperature a. Operating 6.4.4.1 Shock 6.4.3 Effective altitude sea level a. Operating6.4.4 Shock and vibration Figure 12. Recommended mounting Packaged/product weightPackage size Drop height6.4.7 Electromagnetic susceptibility 6.4.5 Air cleanliness6.4.4.2 Vibration a. Operating-normal 6.4.6 AcousticsFigure 13. Mounting configuration dimensions 6.5 Mechanical specifications7.2 Drive error recovery procedures 7.0 Defect and error management7.1 Drive internal defects/errors Cheetah 15K.4 FC Product Manual, Rev. B 7.3 FC-AL system errors 7.4.1 Media Pre-Scan 7.4 Background Media Scan8.1 Drive ID/option selection 8.0 InstallationFigure 14. Physical interface 8.2 LED connectionsFigure 15. LED indicator connector 8.4 Cooling 8.2.1 J6 connector requirements8.3 Drive orientation K x X = F 15lb = 67N 8.5 Drive mounting8.6 Grounding 9.0 Interface requirements 9.1 FC-AL features9.1.1 Fibre Channel link service frames Task name 9.1.2 Fibre Channel task management functions9.1.3 Fibre Channel task management responses Fibre Channel SCSI FCP task management functionsBytes 9.1.4 Fibre Channel port loginNPort login PLOGI payload Process Login PLRI payload 9.1.5 Fibre Channel port login accept9.1.6 Fibre Channel Process Login NPort Login Accept ACC payloadFabric Login FLOGI payload 9.1.7 Fibre Channel Process Login Accept9.1.8 Fibre Channel fabric login Process Login Accept ACC payloadFabric Login Accept ACC payload 9.1.9 Fibre Channel fabric accept login9.1.10 Fibre Channel Arbitrated Loop options 9.2 Dual port supportCommand name 9.3 SCSI commands supportedTable 16 Supported commands Command codeTable 16 Supported commands continued Cheetah 15K.4 FC Product Manual, Rev. B 3 Reference Mode Sense command 1Ah for mode pages supported 9.3.2 Mode Sense data 9.3.1 Inquiry dataDefinitions SAV = Current saved value CHG = Changeable bits indicates if default value is changeable3. Current values 4. Changeable valuesMODE SENSE 10 BYTE HEADER DATA Cheetah 15K.4 FC Product Manual, Rev. B Cheetah 15K.4 FC Product Manual, Rev. B Miscellaneous status 9.4 Miscellaneous operating features and conditionsMiscellaneous features Feature or condition9.5.1.1 Physical description 9.5.1 Physical characteristics9.5 FC-AL physical interface Figure 20. J6 connector dimensions 9.5.2 Connector requirementsFeatures FC-AL SCA device connector dimensions9.5.4 Pin descriptions 9.5.3 Electrical descriptionFigure 21. FC-AL transmitters and receivers 9.5.6 Power9.5.7 Fault LED Out 9.5.5 FC-AL transmitters and receiversNormal command activity 9.5.9 Enable port bypass signals9.5.8 Active LED Out 9.5.10 Motor start controls9.5.11 SEL6 through SEL0 ID lines 9.5.11.1 Parallel Enclosure Services Interface ESISEL ID SettingArbitrated loop physical address ALPA values ALPA9.6.1 9.6 Signal characteristicsTTL input characteristics 9.5.12 Device control codesBit Time Vout mv XMIT Eye 9.6.2 LED driver signals9.6.3 FC Differential output 9.6.4 FC Differential input941 ps 659 ps 376 ps Receive eye diagramEye diagram data values Vin mvCheetah 15K.4 FC Product Manual, Rev. B Internet 10.0 Seagate Technology support servicesOnline services Seagate Service CentersData Recovery Services Customer Service OperationsUSA/Canada/Latin America support services Seagate Service Centers Warranty ServiceWarranty Service European support servicesAfrica/Middle East support services FAX services-All Europe toll callAsia/Pacific support services Numerics IndexDownload microcode with offsets and save mode 7 front panel 38 FS 49, 50, 52 function pin descriptions 66 PN 49 mounting 46 holes 46 orientationsNN 49 Self-Monitoring Analysis and Reporting Technology 9 UI 50, 51 unformatted SMP = 1 in Mode Select command 63 SO 49LED driver 72 single-unit shipping pack kit 10 SMART 9 Page Seagate Technology LLC