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.