计算机专业英语key-term chapter 7说课讲解.doc

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1、精品好文档，推荐学习交流KeyTerms-Chapter7 accessspeedMeasurestheamountoftimerequiredbythestoragedevicetoretrievedataandprograms.Blu-raydisc(BD)Atypeofhigh-definitiondiscwithacapacityof25to50gigabytes.capacityCapacityishowmuchdataaparticularstoragemediumcanholdandanothercharacteristicofs

2、econdarystorage.CD(compactdisc)Widelyusedopticaldiscformat.Itholds650MB(megabytes)to1GB(gigabyte)ofdataononesideoftheCD.CD-R(CD-recordable)StandsforCD-recordable.Thisopticaldisccanbewrittentoonlyonce.Afterthatitcanbereadmanytimeswithoutdeteriorationbutcannotbewrittenonoreras

3、ed.UsedtocreatecustommusicCDsandtoarchivedata.CD-ROM(compactdisc–read-onlymemory)Opticaldiscthatallowsdatatobereadbutnotrecorded.Usedtodistributelargedatabases,references,andsoftwareapplicationpackages.CD-RW(compactdisc–rewriteable)Areusable,opticaldiscthatisnotpermanentlyal

4、teredwhendataisrecorded.Usedtocreateandeditlargemultimediapresentations.cloudcomputingDatastoredataserverontheInternetandavailableanywheretheInternetcanbeaccessed.cylinderHarddisksstoreandorganizefilesusingtracks,sectors,andcylinders.Acylinderrunsthrougheachtrackofastackofpl

5、atters.Cylindersdifferentiatefilesstoredonthesametrackandsectorofdifferentplatters.density仅供学习与交流，如有侵权请联系网站删除谢谢7精品好文档，推荐学习交流Referstohowtightlythebits(electromagneticcharges)canbepackednexttooneanotheronafloppydisk.diskcachingMethodofimprovinghard-diskperformancebyanticipatin

6、gdataneeds.Frequentlyuseddataisreadfromtheharddiskintomemory(cache).Whenneeded,dataisthenaccesseddirectlyfrommemory,whichhasamuchfastertransferratethanfromtheharddisk.Increasesperformancebyasmuchas30percent.DVD(digitalversatilediscordigitalvideodisc)SimilartoCD-ROMsexcepttha

7、tmoredatacanbepackedintothesameamountofspace.DVD drivescanstore4.7GBto17GBonasingleDVDdiscor17timesthecapacityofCDs.DVDplayerAlsoknownasDVD-ROMdrives. See DVD.DVD–R(DVDrecordable)ADVDwithawrite-onceformatthatdiffersslightlyfromtheformatofDVD+R.Typicallyusedtocreatepermanenta

8、rchivesforlargeamountsofdataandtorecordvideos.DVD+R(DVDrecordable)ADVDwitha