Power dissipation | Seagate ST3400755SS instruction

Figure 19. Typical ST3400755SS drive +5V and +12V current profiles

6.3Power dissipation

Typical power dissipation under idle conditions in 3Gb operation is 8.19 watts (27.95 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 20). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.

		ST3400755SS CURRENT/POWER vs THROUGHPUT (SAS - 3.0GB)
	1.400			Random 8 Block Reads				14.00
	1.400							14.00	5Volt A
									5Volt A
									12 Volt A
	1.200							12.00	Watts
									Watts
	1.000							10.00
Amperes	0.800							8.00	Pow er (watts)
	0.600							6.00

	0.400							4.00
	0.200							2.00
	0.000							0.00
	0.0	50.0	100.0	150.0	200.0	250.0	300.0	350.0
				I/Os per Second

Figure 20. ST3400755SS (3 Gbit) DC current and power vs. input/output operations per second

Cheetah NS SAS Product Manual, Rev. B

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Seagate manual Power dissipation, Typical ST3400755SS drive +5V and +12V current profiles

Contents

ST3400755SS Cheetah NS SASPage Contents Interface requirements Defect and error managementInstallation Seagate Technology support services Typical ST3400755SS drive +5V and +12V current profiles List of Figures Cheetah NS SAS Product Manual, Rev. B Scope Cheetah NS SAS Product Manual, Rev. B Electromagnetic susceptibility Standards, compliance and reference documentsStandards Electromagnetic compatibility Compliance Reference documents Cheetah NS SAS Product Manual, Rev. B General description Reliability Standard featuresMedia description Performance ST3400755SS Factory-installed optionsFormatted capacities Programmable drive capacity Cheetah NS SAS Product Manual, Rev. B Seek performance Performance characteristicsInternal drive characteristics Access time General performance characteristics Format command execution time minutesStart/stop time Cache operation Prefetch/multi-segmented cache controlCaching write data Prefetch operation Unrecoverable Errors Reliability specificationsError rates Recoverable Errors Preventive maintenance Reliability and serviceSeek errors Interface errors Reporting control 4 S.M.A.R.TControlling S.M.A.R.T Performance impact Predictive failures Temperature Log Page 0DhThermal monitor Invoking DST State of the drive prior to testingDST failure definition Implementation Log page entries Product warrantyShort test Function Code 001b Extended test Function Code 010b Product repair and return information Shipping Cheetah NS SAS Product Manual, Rev. B ST3400755SS DC power requirements Physical/electrical specificationsAC power requirements DC power requirements Current profiles General DC power requirement notesPower sequencing Conducted noise immunity Typical ST3400755SS drive +5V and +12V current profiles Power dissipation Environmental limits Temperature Shock Relative humidityEffective altitude sea level Shock and vibration Recommended mounting Package size Packaged/product weight Drop height Corrosive environment Air cleanlinessVibration Acoustics China Restriction of Hazardous Substances RoHS Directive X表示该部件（于同类物品程度上）所含的危险和有毒物质中国RoHS MCV标准所定义的门槛值。 Physical dimensions Mechanical specifications Cheetah NS SAS Product Manual, Rev. B Drive internal defects/errors Defect and error managementDrive error recovery procedures 77.87 Background Media Scan SAS system errorsMedia Pre-Scan Idle Read After Write Deferred Auto-Reallocation Drive orientation Installation Air flow Cooling Grounding Drive mounting Cheetah NS SAS Product Manual, Rev. B Interface requirements SAS features Dual port support Commands supported by Cheetah NS SAS family drives Scsi commands supportedCommand name Command code Supported Commands supported by Cheetah NS SAS family drives Commands supported by Cheetah NS SAS family drives Commands supported by Cheetah NS SAS family drives Inquiry data Mode Sense dataCheetah NS SAS inquiry data Bytes Data hex Page Mode Pages 2.1 ST3400755SS Mode Sense data Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features Supported Feature or condition SAS physical interface Datum B Connector requirements Physical characteristics SAS pin descriptions Pin Signal name Signal typeElectrical description Pin descriptions Ready LED Out Signal characteristicsPower SAS transmitters and receivers Eye masks Eye masks overview LED drive signalDifferential signals General interface characteristics Normalized time in UI Receive eye maskJitter tolerance masks Absolute amplitude Frequency in kHz Peak-toSinusoidal Jitter Signal characteristica Units Gbps Transmitter signal characteristics Gbps m, n Deterministic jitterq Receiver signal characteristicsSignal characteristic Units Gbps Maximum allowable jitter Impedance requirements Sheet 1 Impedance specificationsReceiver jitter tolerance Compliant jitter test pattern Cjtpat Impedance requirements Sheet 2 Transmitter characteristicsElectrical TxRx connections = -5,437dB Shows the zero-length test load Receiver characteristics Cheetah NS SAS Product Manual, Rev. B 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 IndexPage SAS See also cooling