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Storage device



Commonstoragedevices

1.Devicesthatuseelectricalenergytostoreinformation,suchasvarioustypesofmemory,suchasRAM,ROM,etc.

Storagedevices(6photos)

2.Devicesthatusemagneticenergytostoreinformation,suchasharddisks,floppydisks,magnetictapes,magneticcorememory,bubblememory,Udisks

3,devicesthatuseopticalmethodstostoreinformationSuchas:CDorDVD

4.Devicesthatusemagneto-opticalmethodstostoreinformationsuchas:MO(MagnetoOpticalDisk)

5.UseotherphysicalobjectssuchaspapercardsandtapesforstorageInformationdevicessuchas:punchcards,punchbelts,knots,etc.

6.Storagesystem:adedicatedinformationsystemfordatabackupordisasterrecovery,andhigh-speednetworkforlargedatastorageinformationinstallation.

Removablestoragedevice

PDopticaldrive

PDistheabbreviationof"PhaseChangeRewritableOpticalDiskDrive"inEnglishAbbreviation.PDdiscadoptsthephase-changelightmethod,anditsdatareproductionprincipleisthesameasthatofCDdisc.Thesignalisjudgedby1and0basedonthedifferenceintheamountofreflectedlight.ThePDdischasthesameshapeastheCDdisc,andisusedinaboxtoprotectthedataonthediscsurface.

Theopticaldiscsystemadoptsaunitformatthatiswidelyusedincomputerandworkstationenvironments,andhasthesamedatastructureasfloppydisksandharddisks,andalsoadopts512bit/unitMCAVthatcanbeusedimmediatelyinacomputerenvironmentTheformat,usingthisformat,canperformreadandwriteoperationsatahigherspeedthantheCD-R/CD-RWthatusestheCLVformat,andachievesahighersearchspeed.Basedontheaboveadvantages,thePDhasbeensupportedbythecomputerOSledbyWindows95fromthebeginning,andduetothestandardizationoftheATAPIinterface,ithasestablisheditsproductstatusasacomputerstandarddevice.Inordertoprotecttheopticaldisc,thephase-changeopticaldiscsystemadoptsthemethodofputtingtheopticaldiscinaprotectiveboxforuse,andtheCDdiscisusedasabaredisc.InordertoprocessPDboxeddiscsandbareCDdiscsatthesametime,thePDdiscsystemadoptsanewtrayfillingmethod.ThismethodwillalsobeusedonDVD-RAM.

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