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Incomputerhardware,SerialATA(SATA,isacomputerbustechnologyprimarilydesignedfortransferofdatatoandfromaharddisk.ItisthesuccessortothelegacyAdvancedTechnologyAttachmentstandard(ATA,alsoknownasIDE).ThisoldertechnologywasretroactivelyrenamedParallelATA(PATA)todistinguishitfromSerialATA.TheSerialATA[SATA]busisdefinedovertwoseparateconnectors,oneconnectorforthedatalinesandoneforthepowerlines.ASerialATAHarddrivemayalsohaveathirdconnectorforlegacyPATApowerconnections.ThePATApowerconnectormaybeusedininsteadoftheSATApowertosupplyaconnectionwhichismoreruggedandreliablethentheSATA-1powerconnection.TheSerialATAinterface[SATA]istheserialversionoftheIDE[ATA]spec.SATAusesa4conductorcablewithtwodifferentialpairs[Tx/Rx],plusanadditional3groundspinsandaseparatepowerconnector.Datarunsat150MBps[1.5GHz]using8B/10Bencodingand250mVsignalswings,withamaximumbuslengthof1meter.SATAenhancementsmovethedatatransferspeedto;300MBps[3.0Gbps],andthen600MBps[6.0Gbps].ThecurrentspeedforSATAis300Mbps[3Gbps].ShieldedexternalSATA[eSATA]datacablerunsouttoamaximumofbetween3feetand6feet.eSATAcablesareusedexternaltothechassisorcase.SATADatapinoutSATAPinOut,DataPin#SignalNameSignalDescription1GNDGround2A+Transmit+3A-Transmit-4GNDGround5B-Receive-6B+Receive+7GNDGroundSATAPowerpinoutSATAPinOut,PowerPin#SignalNameSignalDescription1V333.3vPower2V333.3vPower3V333.3vPower,Pre-charge,2ndmate4Ground1stMate5Ground2ndMate6Ground3rdMate7V55vPower,pre-charge,2ndmate8V55vPower9V55vPower10Ground2ndMate11Reserved-12Ground1stMate13V1212vPower,Pre-charge,2ndmate14V1212vPower15V1212vPowerPATAPowerpinoutIDEPowerConnectorPinOutPin#SignalFunction18AWGWire1+12VDCYellow2+12VReturnBlack3+5VReturnBlack4+5VDCRedSATAsignalnamesarewithrespecttotheHost,thedeviceconnectedtothehostreversesthesignalnames.TransmitpinsconnecttoReceivepinsontheotherdevice.TheSATAconnectoriskeyedatpin1.ThesepinoutsfortheSerialATAconnectorarenotcompatiblewiththelegacyPATAconnector.SATA1.5Gb/sFirst-generationSerialATAinterfaces,alsoknownasSATA/150,runat1.5Gigahe
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