硬盘结构及基本知识

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1、ByPatiwatKamonpetBasicDiscDriveDiscDriveOverviewDiscDriveBasicsMagneticRecordingBasicsRecordingChannelComputerSystemDiscDriveOverviewToday’sPCArchitectureIOBusLogicISABusOtherperipheralsCPUPentiumProMemoryPCIBridgeChipVideoGraphicsAdapterCardInterfaceAdapterCar

2、dMonitorIDEorSCSIDiscDriveCableRibbonCablePCIBoardEdgeConnectionPCIBoardEdgeConnectionPCIBusLocalSystemBusWiredonMotherBoardWiredonMotherBoardWiredonMotherBoardFilesCollectionofBytesTextDocumentComputerInstructionsPictureetc..SequenceofBlocksStoredinFileisrefer

3、encedbyafilenameratherthanlocationondisk.Filesaremanagedbythecomputer’soperatingsystem..Thediskdrivehasnoawarenessoffiles.StoringFilesonDiscDriveComputerDiscDriveHereare3BlockofDataStartStoringinLocation5ControllerInterfaceAdapterFile:Letter.DOCLETTWR.DOCANOTHE

4、R.DOC01234567891011121314151617181920DIRECTORYTransferRateinMegaMytespersecond(MBps)HowtoAccessFilesDirectory=AListofFilenamesandLacationsFilenameLETTER.DOCPROGRAM.EXEANOTHER.DOC...Blocklocationondisk5,6*,7*1024,1025*,1026*,1027*12,13*,14*,15*,16*...Theoperatin

5、gsysteminthecomputerkeepstrackofthedirectory*InDOS,thedirectorykeepstrackofthelocationforonlythe1stblockofeachfile.TheFileAllocationTable,orFAT,keepstrackofthelocationoftheotherblocks.HDAComponentsDISCCIRCULATEFILTERCLAMPRINGODLIMITSTOPBOTTOMPOLEVCMPCCPREAMPCHI

6、PIDLIMITSTOPHEADFLEXUREARMPIVOTCARTRIDGEBEARINGTOPVIEWDiscDriveBasicsPCBComponentsHOSTCONTROLLERVCM&SPINDLECONTROLLERREAD/WRITECHANNELMICROCONTROLLERSERVOCONTROLLERSRAMDRAMSHOCKSENSORSPINDLECONNECTORHDACONNECTORSHOCKICMassStorageArchitectureUsingDiscDrivesRead/

7、WriteChannelPositionSystemSPMControlSpindleMotorVCM(VoiceCoilMotor)ControllerInterfaceAdapterMemoryCPUPC-ATSystemBus(ISA)SCSIRibbonCableEmbebbedonmotherboardoradd-incardBlockDefinitionsREAD/WRITEDetectsbitsfromthesignalcomingfromtheCHANNELhead(analog)andconvert

8、sthemintodigitalbitsPOSITIONSYSTEMSeekstoandkeepstheheadspositionedoverthecorrecttrackofdataonthedisk(E-Block-VCM-Servo)SPMCONTROLKeepsthediskrotatingandattheproperspeedCONT