Introductiontothetapedrive
Theautomaticloadingtapedriveisactuallyacombinationoftapeandtapedrive.Theautoloaderisatapedriveandautomatictapechangerlocatedinasinglemachine.Itcanpickuptapesfromacassettecontainingmultipletapesandputthemintothedrive,orperformthereverseprocess.Itcanbackupdataof100GB-200GBormore.Auto-loadingtapedrivescansupportroutinebackupprocessesandautomaticallyloadnewtapesfordailybackuptasks.Asmallcompanywithaworkgroupservercanuseanautoloadertoautomatebackuptasks.
Theprincipleoftapestorage
Tapeisoneofthecommonlyusedstoragemediawiththelowestunitstorageinformationcost,thelargestcapacity,andthehighestdegreeofstandardizationamongallstoragemedia.Ithasgoodinterchangeabilityandiseasytostore.Inrecentyears,duetotheuseofcodingtechnologywithhigherrorcorrectioncapabilityandthewrite-readchanneltechnology,thereliabilityoftapestorageandthespeedofreadingandwritinghavebeengreatlyimproved.Accordingtotheworkingprincipleofreadingandwritingtapes,itcanbedividedintospiralscanningtechnology,linearrecording(dataflow)technology,DLTtechnologyandmoreadvancedLTOtechnology
Technologie spirálového skenování, čtení a psaní:
ThemagnetictapereadingandwritingtechnologythatreadsandwritesdataonthetapebyspiralscanningisbasicallysimilartothatofaVCR.Thetapeiswoundaroundmostofthedrumandadvanceshorizontallyatalowspeed,whilethedrumisreversedduringthetapereadingandwritingprocess.High-speedrotation,themagneticheadinstalledonthesurfaceofthedrumcompletesthedataaccessandread-writeworkduringtherotation.Themagneticheadmaintainsaninclinationangleof15degreeswiththetapeduringreadingandwriting,andthetracksarearrangedinparallelonthetapeataninclinationangleof75degrees.Usingthisread-writetechnologycanobtainmoredatachannelsonthesametapearea,makefulluseoftheeffectivestoragespaceofthetape,andthushaveahigherdataaccessdensity.
Technologie lineárního záznamu, čtení a zápis:
Thetaperead-writetechnologyforreadingandwritingdataonthetapeinalinearrecordingmodeisbasicallythesameasthatofataperecorder,paralleltotheheadThehigh-speedmovingmagnetictapeskimmedthestationarymagneticheadfordatarecordingorreadingoperations.Thistechnologycanmakethedesignofthedrivesystemsimple,andthereadandwritespeedislow,butbecausethedatarecordingtrackonthetapeisparalleltobothsidesofthetape,thedatastorageutilizationrateislow.Inordertoeffectivelyimprovetheutilizationrateandread/writespeedofthetape,peoplehavedevelopedamulti-headparallelread/writemethodtoincreasetherecordingdensityandtransmissionrateofthetape.However,thedesignofthedrivehasbecomeextremelycomplicatedandthecosthasalsoincreased.
Technologie digitálních pásek:
DLTisanadvancedstoragetechnologystandard,including1/2-inchtape,linearrecordingmethod,andpatentedtapeimportKeytechnologiessuchasdevicesandspecialtapecassettes.ThetapedriveusingDLTtechnologyhas128tracksonatapewithatapelengthof1828feetandabandwidthof1/2inch.Theuncompressedcapacityofasingletapecanbeashighas20GB,andthecapacitycanbedoubledaftercompression.
Linearopentapetechnology:
Thisisahigh-techtapeprocessingtechnologysupportedbythethreemajorstorageequipmentmanufacturingcompaniesofIBM,HP,andSeagate.ItCangreatlyincreasetheamountoftapebackupdata.LTOtapecanincreasethecapacityofthetapeto100GB,ifcompressed,itcanreach200GB.LTOtechnologycannotonlyincreasethechanneldensityofthetape,butalsomakeoverallimprovementsintheheadandservostructure.LTOtechnologyusesanadvancedtrackservotrackingsystemtoeffectivelymonitorandcontroltheprecisepositioningoftheheadandpreventmiswritingofadjacenttracks.Theproblemistoachievethepurposeofincreasingthetrackdensity.
Typesoftapes
Thetapescanbedividedintosixspecificationsaccordingtotheworkingprincipleofreadingandwritingtapes.TwoofthemareDAT(4mm)tapedrivesforworkgroupleveland8mmtapedrivesfordepartmentlevel.Theotherfouraredevicesdesignedwithdatastreamstoragetechnology.TheyusesingleThemagneticheadreadandwritemethod,thetapewidthis1/4inch,TravanandDCseriesforlow-endapplications,andthemulti-headreadandwritemethod,thetapewidthis1/2inch,DLTandIBM's3480/forhigh-endapplications3490/3590seriesandsoon.
1/4 palce:
QIC(QuarterInchCartridge:1/4palcová páska)páska je páska se šířkou pásma 1/A4palcová kazeta s kazetou, také nazývaná 1/4palcová páska. Má dvě specifikace, jmenovitě DC6000 a DC2000. Jednotka pásky DC2000 pouze 3,5 palce, cena jednotky je nízká, standardizace je vysoká a výrobci jsou vzájemně kompatibilní. Kapacita úložiště kazety pásky DC2000 je obecně 400 MB, což je jedna z nejpoužívanějších pásek .
DigitalAudioTape:
DAT(DigitalAudioTape:DigitalAudioTape)tape,themagneticbandwidthis0.15inches(4mm),alsocalled4mmtape.Becausethetapestoragesystemusesspiralscanningtechnology,thetapehasahighstoragecapacity.DATtapesystemsgenerallyusewriteandreadandcompressiontechnology,whichnotonlyimprovesthereliabilityanddatatransmissionrateofthesystem,butalsoincreasesthestoragecapacity.Atpresent,thestoragecapacityofaboxofDATtapescanreach12GB.Atthesametime,manymanufacturersofDATtapesanddrivesareapromisingdatabackupproduct.
8mm páska:
Itisalarge-capacitytapethatisonlydevelopedbyExabyteandissuitableforlargeandmedium-sizednetworksandmulti-usersystems.The8mmtapeanditsdrivealsousespiralscanningtechnology,andthetapeiswider,sothestoragecapacityisextremelyhigh,themaximumcapacityofatapecanreach14GB.Butthebrandissingleandtherearefewertypes.
1/2palcová páska:
ThistypeoftapeisdividedintoDLT(digitallineartape)tapeandIBM3480/3490/3590seriestape..DuetotherapiddevelopmentofDLTtapetechnology,ithasbecomeanimportantstandardfornetworkbackuptapedrivesandtapelibrarysystems,andbecauseofitslargecapacity,highspeedanduniquedevelopmentpotential,ithasbecometheleaderinmediumandhighbackupsystems.DLTtapeshaveacapacityofupto35GBpercartridge,andthecostperunitcapacityislow;IBM3480/3490/3590seriestapesareproducedbyIBM,andthestoragecapacityofeachcartridgecanreach10GB.Thecorrespondingdrivesystemisactuallyatapelibrary.Storemultipletapes,anditsmanipulatorcanautomaticallyselectanyoneofthemtothedrive.