Power dissipation | Seagate ST3450856SS, ST3146356SS, ST3300656SS

6.3Power dissipation

ST3450856SS in 3 Gbit operation

Typical power dissipation under idle conditions in 3Gb operation is 12.67 watts (43.23 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 5). 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.

		ST3450856SS CURRENT/POWER vs THROUGHPUT (SAS - 3.0GB)
	1.400				Random 8 Block Reads				20.00
	1.400								20.00	5Volt A
										5Volt A
	1.200								18.00	12 Volt A
	1.200									Watts
									16.00	Watts
									16.00
	1.000								14.00
									14.00	Power (watts)
Amperes	0.800								12.00
	0.800
									10.00
	0.600								8.00
									8.00

	0.400								6.00
	0.400
									4.00
	0.200								2.00
									2.00
	0.000								0.00
	0.0	50.0	100.0	150.0	200.0	250.0	300.0	350.0	400.0
				I/Os per Second

Figure 5. ST3450856SS (3 Gbit) DC current and power vs. input/output operations per second

Cheetah 15K.6 SAS Product Manual, Rev. A

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Image 35

Seagate ST3146356SS, ST3300656SS manual Power dissipation, ST3450856SS in 3 Gbit operation

Contents

ST3450856SS ST3300656SS ST3146356SS Cheetah 15K.6 SASPage Contents Interface requirements Defect and error managementInstallation Seagate Technology support services Cheetah 15K.6 SAS disk drive List of Figures Cheetah 15K.6 SAS Product Manual, Rev. a Cheetah 15K.6 SAS disk drive Scope Cheetah 15K.6 SAS Product Manual, Rev. a Electromagnetic susceptibility Standards, compliance and reference documentsStandards Electromagnetic compatibility European Union Restriction of Hazardous Substances RoHS Compliance Reference documents Cheetah 15K.6 SAS Product Manual, Rev. a General description Performance Standard featuresMedia description Formatted capacities Factory-installed accessoriesOptions factory installed Reliability Cheetah 15K.6 SAS Product Manual, Rev. a Seek time Performance characteristicsInternal drive characteristics Access time Start/stop time Format command execution time minutesGeneral performance characteristics Cache operation Prefetch/multi-segmented cache control Prefetch operation Caching write data 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 Parameter Code Description Temperature Log Page 0DhPrimary Temperature Reference Temperature Short test Function Code 001b State of the drive prior to testingInvoking DST Short and extended tests Product repair and return information Product warrantyAbort Shipping Cheetah 15K.6 SAS Product Manual, Rev. a ST3450856SS DC power requirements Physical/electrical specificationsAC power requirements DC power requirements ST3146356SS Gbit mode Amps ST3300656SS DC power requirementsST3146356SS DC power requirements ST3300656SS Gbit mode Amps Current profiles General DC power requirement notesPower sequencing Conducted noise immunity Typical ST3450856SS current profiles Typical ST3300656SS current profiles Typical ST3146356SS current profiles ST3450856SS in 3 Gbit operation Power dissipation ST3300656SS in 3 Gbit operation ST3300656SS CURRENT/POWER vs Throughput SAS 3.0GB Random 8 Block Reads ST3146356SS CURRENT/POWER vs Throughput SAS 3.0GBST3146356SS in 3 Gbit operation 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 Mechanical specifications Physical dimensions Cheetah 15K.6 SAS Product Manual, Rev. a Drive error recovery procedures Defect and error managementDrive internal defects/errors 51.87 Media Pre-Scan SAS system errorsBackground Media Scan Idle Read After Write Deferred Auto-Reallocation Drive orientation Installation Air flow Cooling Grounding Drive mounting Cheetah 15K.6 SAS Product Manual, Rev. a Interface requirements SAS features Dual port support Command name Command code Supported Scsi commands supportedCommands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Bytes Data hex Mode Sense dataInquiry data Page Mode Pages 2.1 ST3450856SS Mode Sense data 2.2 ST3300656SS Mode Sense data 2.3 ST3146356SS 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 Electrical TxRx connections Transmitter characteristicsImpedance requirements Sheet 2 = -5,437dB Shows the zero-length test load Receiver characteristics Cheetah 15K.6 SAS Product Manual, Rev. a Technical Support Seagate Technology support servicesInternet Presales Support Data Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Numerics IndexPage SAS See also cooling