硬盘结构及基本知识.ppt

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1、ByPatiwatKamonpetBasicDiscDriveDiscDriveOverviewDiscDriveBasicsMagneticRecordingBasicsRecordingChannelComputerSystemDiscDriveOverviewToday’sPCArchitectureIOBusLogicISABusOtherperipheralsCPUPentiumProMemoryPCIBridgeChipVideoGraphicsAdapterCardInterfaceAdapterCardMonitorIDEorSCSI

2、DiscDriveCableRibbonCablePCIBoardEdgeConnectionPCIBoardEdgeConnectionPCIBusLocalSystemBusWiredonMotherBoardWiredonMotherBoardWiredonMotherBoardFilesCollectionofBytesTextDocumentComputerInstructionsPictureetc..SequenceofBlocksStoredinFileisreferencedbyafilenameratherthanlocation

3、ondisk.Filesaremanagedbythecomputer’soperatingsystem..Thediskdrivehasnoawarenessoffiles.StoringFilesonDiscDriveComputerDiscDriveHereare3BlockofDataStartStoringinLocation5ControllerInterfaceAdapterFile:Letter.DOCLETTWR.DOCANOTHER.DOC01234567891011121314151617181920DIRECTORYTrans

4、ferRateinMegaMytespersecond(MBps)HowtoAccessFilesDirectory=AListofFilenamesandLacationsFilenameLETTER.DOCPROGRAM.EXEANOTHER.DOC...Blocklocationondisk5,6*,7*1024,1025*,1026*,1027*12,13*,14*,15*,16*...Theoperatingsysteminthecomputerkeepstrackofthedirectory*InDOS,thedirectorykeeps

5、trackofthelocationforonlythe1stblockofeachfile.TheFileAllocationTable,orFAT,keepstrackofthelocationoftheotherblocks.HDAComponentsDISCCIRCULATEFILTERCLAMPRINGODLIMITSTOPBOTTOMPOLEVCMPCCPREAMPCHIPIDLIMITSTOPHEADFLEXUREARMPIVOTCARTRIDGEBEARINGTOPVIEWDiscDriveBasicsPCBComponentsHOS

6、TCONTROLLERVCM&SPINDLECONTROLLERREAD/WRITECHANNELMICROCONTROLLERSERVOCONTROLLERSRAMDRAMSHOCKSENSORSPINDLECONNECTORHDACONNECTORSHOCKICMassStorageArchitectureUsingDiscDrivesRead/WriteChannelPositionSystemSPMControlSpindleMotorVCM(VoiceCoilMotor)ControllerInterfaceAdapterMemoryCPU

7、PC-ATSystemBus(ISA)SCSIRibbonCableEmbebbedonmotherboardoradd-incardBlockDefinitionsREAD/WRITEDetectsbitsfromthesignalcomingfromtheCHANNELhead(analog)andconvertsthemintodigitalbitsPOSITIONSYSTEMSeekstoandkeepstheheadspositionedoverthecorrecttrackofdataonthedisk(E-Block-VCM-Servo

8、)SPMCONTROLKeepsthediskrotatingandattheproperspeedCONT