Cooling, Air flow | Seagate ST3400755SS guide

8.2Cooling

The host enclosure must dissipate heat from the drive. You should confirm that the host enclosure is designed to ensure that the drive operates within the temperature measurement guidelines described in Section 6.4.1. In some cases, forced airflow may be required to keep temperatures at or below the temperatures specified in Section 6.4.1.

If forced air is necessary, possible air-flow patterns are shown in Figure 25. The air-flow patterns are created by fans either forcing or drawing air as shown in the illustrations. Conduction, convection, or other forced air- flow patterns are acceptable as long as the temperature measurement guidelines of Section 6.4.1 are met.

Note. Air flows in the direction shown (back to front) or in reverse direction (front to back)

Above unit

Under unit

Note. Air flows in the direction shown or in reverse direction (side to side)

Figure 25. Air flow

Above unit

Under unit

38	Cheetah NS SAS Product Manual, Rev. B

Image 44

Seagate ST3400755SS manual Cooling, Air flow

Contents

Cheetah NS SAS ST3400755SSPage Contents Defect and error management InstallationSeagate Technology support services Interface requirements List of Figures Typical ST3400755SS drive +5V and +12V current profiles Cheetah NS SAS Product Manual, Rev. B Scope Cheetah NS SAS Product Manual, Rev. B Standards, compliance and reference documents StandardsElectromagnetic compatibility Electromagnetic susceptibility Compliance Reference documents Cheetah NS SAS Product Manual, Rev. B General description Standard features Media descriptionPerformance Reliability Factory-installed options Formatted capacitiesProgrammable drive capacity ST3400755SS Cheetah NS SAS Product Manual, Rev. B Performance characteristics Internal drive characteristicsAccess time Seek performance Start/stop time Format command execution time minutesGeneral performance characteristics Caching write data Prefetch/multi-segmented cache controlCache operation Prefetch operation Reliability specifications Error ratesRecoverable Errors Unrecoverable Errors Reliability and service Seek errorsInterface errors Preventive maintenance 4 S.M.A.R.T Controlling S.M.A.R.TPerformance impact Reporting control Thermal monitor Temperature Log Page 0DhPredictive failures State of the drive prior to testing DST failure definitionImplementation Invoking DST Product warranty Short test Function Code 001bExtended test Function Code 010b Log page entries Shipping Product repair and return information Cheetah NS SAS Product Manual, Rev. B Physical/electrical specifications AC power requirementsDC power requirements ST3400755SS DC power requirements General DC power requirement notes Power sequencingConducted noise immunity Current profiles Power dissipation Typical ST3400755SS drive +5V and +12V current profiles Temperature Environmental limits Relative humidity Effective altitude sea levelShock and vibration Shock Package size Packaged/product weight Drop height Recommended mounting Air cleanliness VibrationAcoustics Corrosive environment 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。 China Restriction of Hazardous Substances RoHS Directive Mechanical specifications Physical dimensions Cheetah NS SAS Product Manual, Rev. B Drive error recovery procedures Defect and error managementDrive internal defects/errors 77.87 Media Pre-Scan SAS system errorsBackground Media Scan Deferred Auto-Reallocation Idle Read After Write Installation Drive orientation Cooling Air flow Drive mounting Grounding Cheetah NS SAS Product Manual, Rev. B SAS features Interface requirements Dual port support Command name Command code Supported Scsi commands supportedCommands supported by Cheetah NS SAS family drives Commands supported by Cheetah NS SAS family drives Commands supported by Cheetah NS SAS family drives Commands supported by Cheetah NS SAS family drives Cheetah NS SAS inquiry data Bytes Data hex Mode Sense dataInquiry data Page 2.1 ST3400755SS Mode Sense data Mode Pages Miscellaneous operating features and conditions Miscellaneous featuresSupported Feature or condition Miscellaneous status SAS physical interface Datum B Physical characteristics Connector requirements Pin Signal name Signal type Electrical descriptionPin descriptions SAS pin descriptions Signal characteristics PowerSAS transmitters and receivers Ready LED Out LED drive signal Differential signalsGeneral interface characteristics Eye masks Eye masks overview Receive eye mask Jitter tolerance masksAbsolute amplitude Normalized time in UI Peak-to SinusoidalJitter Frequency in kHz Transmitter signal characteristics Signal characteristica Units Gbps Receiver signal characteristics Signal characteristic Units GbpsMaximum allowable jitter Gbps m, n Deterministic jitterq Impedance specifications Receiver jitter toleranceCompliant jitter test pattern Cjtpat Impedance requirements Sheet 1 Electrical TxRx connections Transmitter characteristicsImpedance requirements Sheet 2 = -5,437dB Shows the zero-length test load Receiver characteristics Cheetah NS SAS Product Manual, Rev. B Seagate Technology support services InternetPresales Support Technical Support Data Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Index NumericsPage SAS See also cooling