Seagate ST318418N, ST318438LW, ST336938LW, ST336918N manual Drive orientation, Cooling, Air flow

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42	Barracuda 36ES2 Product Manual, Rev. B

8.1.3Drive orientation

The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive perfor- mance characterization, however, has been done with the drive in horizontal (discs level) and vertical (drive on its side) orientations, and these are the two preferred mounting orientations.

8.2Cooling

Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding the drive will not exceed temperature conditions specified in Section 6.4.1, “Temperature.” Specific consider- ation should be given to make sure adequate air circulation is present around the printed circuit board (PCB) to meet the requirements of Section 6.4.1, “Temperature.”

8.2.1Air flow

The rack, cabinet, or drawer environment for the drive must provide heat removal from the electronics and head and disc assembly (HDA). You should confirm that adequate heat removal is provided using the temper- ature measurement guidelines described in Section 6.4.1.

Forced air flow may be required to keep temperatures at or below the specified case temperatures, in which case the drive should be oriented, or air flow directed, so that the least amount of air flow resistance is created while providing air flow to the electronics and HDA. Also, the shortest possible path between the air inlet and exit should be chosen to minimize the travel length of air heated by the drive and other heat sources within the rack, cabinet, or drawer environment.

If forced air is determined to be necessary, possible air-flow patterns are shown in Figure 15. The air-flow pat- terns are created by one or more 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 guide- lines 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)

Above unit

Under unit

Figure 15. Air flow (suggested)

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Contents Product Manual, Volume Page Product Manual, Volume Page Revision status summary sheet Revision Date Writer/Engineer Sheets AffectedPage Contents Defect and error management InstallationSeagate Technology support services Interface requirementsList of Figures Barracuda 36ES2 Product Manual, Rev. B ViiPage Scope Barracuda 36ES2 family drive ST336938LW shownBarracuda 36ES2 Product Manual, Rev. B Applicable standards and reference documentation Korean MIC Australian C-TickTaiwanese Bsmi General description Standard features Media characteristicsPerformance ReliabilityOptions factory installed Factory installed accessoriesProgrammable drive capacity Performance characteristics Start/stop time Ultra2 Scsi Ultra160 ScsiPrefetch/multi-segmented cache control Cache operation Caching write dataPrefetch operation Barracuda 36ES2 Product Manual, Rev. B Reliability specifications Reliability and service Preventive maintenanceService life Service philosophy7 S.M.A.R.T Controlling S.M.A.R.TPerformance impact Reporting controlDetermining rate Predictive failuresState of the drive prior to testing DST Failure DefinitionImplementation Invoking DSTProduct warranty Short test Function Code 001bExtended test Function Code 010b Log page entriesProduct repair and return information Barracuda 36ES2 Product Manual, Rev. B AC power requirements Physical/electrical specificationsDC power requirements Conducted noise immunity Power sequencing3 12 V Current profile +5 Volt Current during spindle start Typical Amper es Amps Power dissipation ST336938/ST318438 Barracuda 36ES2 Product Manual, Rev. B ST336918/ST318418 Temperature Environmental limitsBarracuda 36ES2 Product Manual, Rev. B Relative humidity Effective altitude sea levelShock and vibration ShockRecommended mounting Barracuda 36ES2 Product Manual, Rev. B Vibration Air cleanlinessAcoustics Mechanical specifications Dimension TableMounting configuration dimensions Barracuda 36ES2 Product Manual, Rev. B Drive error recovery procedures Defect and error managementDrive internal defects Scsi systems errors Installation Configure drive optionsFormatting Drive ID/option select headerDo not install jumpers retain cover J6 jumper header for N model J5 jumper header on LW models only J2 option select header for LW models Barracuda 36ES2 Product Manual, Rev. B Barracuda 36ES2 Product Manual, Rev. B Function description Cooling Drive orientationAir flow Barracuda 36ES2 Product Manual, Rev. B Drive mounting GroundingBarracuda 36ES2 Product Manual, Rev. B Interface requirements Scsi interface messages supportedScsi interface commands supported Commands supported by Barracuda 36ES2 family drives Barracuda 36ES2 Product Manual, Rev. B Vendor ID Inquiry Vital Product data Unit serial number page 80hImplemented operating definition page 81h Firmware numbers page C0hJumper settings page C2h Mode Sense data DEF CHG Barracuda 36ES2 Product Manual, Rev. B Condition/features supported Supported Status supported 2 REQ/ACK offset DC cable and connectorPhysical interface Model drive physical interface 50-pin Scsi I/O connector Pin Power Scsi interface physical description Scsi interface cable requirementsBarracuda 36ES2 Product Manual, Rev. B Mating connectors Mating connectors for N model drivesScsi daisy chain interface cabling for N drives Nonshielded 68 pin Scsi device connector used on LW drives Scsi daisy chain interface cabling for LW drives GND GND DBP1 +DBP1 Electrical description Multimode signalsMultimode-SE and LVD alternatives Input characteristics LVD output signalsTransmitter characteristics Receiver characteristicsSingle-ended drivers/receivers for N models Single-ended drivers/receivers for LW modelsGeneral cable characteristics Low voltage differential I/O circuitsTerminator requirements Terminator power DrivesLW drives Page Drive activity LED Following table provides drive activity LED statusSeagate Technology support services Online Services Automated ServicesPresales Support Technical SupportUSA/Canada/Latin America Support Services Customer Service CSOEuropean Support Services Asia/Pacific Support Services Africa/Middle East Support ServicesCall Center Toll-free Direct dial Barracuda 36ES2 Product Manual, Rev. B Index Diffsens LED PCB System chassis Barracuda 36ES2 Product Manual, Rev. B