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Seagate Understanding Power Dissipation in Drives: Insights for ST3146854LC and Similar Models

Models: ST3450056SS (FDE) ST3300056SS (FDE) ST3146756SS (FDE) ST3146854LC ST3146356SSIM

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6.3Power dissipation

ST3450856SS model

Typical power dissipation under idle conditions in 3Gb operation is 11.85 watts (40.44 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 4). 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.

Figure 4. ST3450856SS, 3 Gbit, DC current and power vs. input/output operations per second

30	Cheetah 15K.6 SAS Product Manual, Rev. B

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Seagate ST3450056SS (FDE), ST3146854LC, ST3146756SS (FDE), ST3146356SSIM manual Power dissipation, ST3450856SS model

Contents

ST3300656SS ST3450856SSST3146356SS Page Contents Seagate Technology support services Defect and error managementInstallation Interface requirements Scope Model Number Full Disk Encryption FDE Cheetah 15K.6 SAS Product Manual, Rev. B Electromagnetic compatibility Standards, compliance and reference documentsStandards Electromagnetic susceptibility Compliance European Union Restriction of Hazardous Substances RoHS Reference documents Cheetah 15K.6 SAS Product Manual, Rev. B General description Media description Standard featuresPerformance Formatted capacities Factory-installed optionsReliability Programmable drive capacity Cheetah 15K.6 SAS Product Manual, Rev. B Access time Performance characteristicsInternal drive characteristics Seek time Start/stop time Format command execution time minutesGeneral performance characteristics 176 144 100 Prefetch/multi-segmented cache control Cache operation Caching write data Prefetch operation Recoverable Errors Reliability specificationsError rates Unrecoverable Errors Interface errors Reliability and serviceSeek errors Preventive maintenance Performance impact 4 S.M.A.R.TControlling S.M.A.R.T Milliseconds Predictive failures Reporting controlDetermining rate Thermal monitor Drive Self Test DST Temperature Log Page 0Dh Parameter Code DescriptionState of the drive prior to testing DST failure definition Short test Function Code 001b Invoking DSTShort and extended tests Extended test Function Code 010b Shipping Product warrantyAbort Product repair and return information Cheetah 15K.6 SAS Product Manual, Rev. B DC power requirements Physical/electrical specificationsAC power requirements ST3450856SS DC power requirements ST3450056SS FDE Gbit mode Amps ST3450056SS FDE DC power requirementsST3300656SS DC power requirements ST3300656SS Gbit mode Amps ST3300056SS FDE Gbit mode Amps ST3300056SS FDE DC power requirementsST3146356SS DC power requirements ST3146356SS Gbit mode Amps ST3146756SS FDE DC power requirements ST3146756SS FDE Gbit mode Amps Conducted noise immunity Power sequencingCurrent profiles Typical 450GB current profiles Typical 146GB current profiles Power dissipation ST3450856SS model ST3450056SS FDE model ST3300656SS model ST3300056SS FDE model ST3146356SS model ST3146756SS FDE model in 3 Gbit operation Temperature Environmental limits Shock and vibration Relative humidityEffective altitude sea level Shock Package size Packaged/product weight Drop height Recommended mounting Acoustics Air cleanlinessVibration Corrosive environment Mechanical specifications Physical dimensions Cheetah 15K.6 SAS Product Manual, Rev. B Drive internal defects/errors Defect and error managementDrive error recovery procedures 51.87 Background Media Scan SAS system errorsMedia Pre-Scan Deferred Auto-Reallocation Idle Read After Write Drive orientation InstallationCooling Air flow Drive mounting Grounding Cheetah 15K.6 SAS Product Manual, Rev. B SAS features Interface requirements Dual port support Commands supported by Cheetah 15K.6 SAS family drives Scsi commands supportedCommand name Command code Supported 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 Inquiry data Bytes Data hex Mode Sense data 2.1 ST3450856SS/ST3450056SS Mode Sense data Mode Pages 2.2 ST3300656SS/ST3300056SS Mode Sense data 2.3 ST3146356SS/ST3146756SS Mode Sense data Miscellaneous status Miscellaneous operating features and conditionsMiscellaneous features SAS physical interface Physical interface Datum B Physical characteristics Connector requirements Pin descriptions Pin Signal name Signal typeElectrical description SAS pin descriptions SAS transmitters and receivers Signal characteristicsPower Ready LED Out General interface characteristics LED drive signalDifferential signals Eye masks Eye masks overview Absolute amplitude Receive eye maskJitter tolerance masks Normalized time in UI Jitter Peak-toSinusoidal Frequency in kHz Transmitter signal characteristics Signal characteristica Units Gbps Signal characteristic Units Gbps Receiver signal characteristicsMaximum allowable jitter Compliant jitter test pattern Cjtpat Impedance specificationsReceiver jitter tolerance Impedance requirements Sheet 1 Impedance requirements Sheet 2 Transmitter characteristicsElectrical TxRx connections = -5,437dB Shows the zero-length test load Receiver characteristics Cheetah 15K.6 SAS Product Manual, Rev. B Presales Support Seagate Technology support servicesInternet Technical Support Data Recovery Services Authorized Service Centers Warranty ServiceData Recovery Services Call Center Toll-free Direct dial Index Numerics Iraw SAS See also cooling