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
Технология за спирално сканиране на четене и писане:
ThemagnetictapereadingandwritingtechnologythatreadsandwritesdataonthetapebyspiralscanningisbasicallysimilartothatofaVCR.Thetapeiswoundaroundmostofthedrumandadvanceshorizontallyatalowspeed,whilethedrumisreversedduringthetapereadingandwritingprocess.High-speedrotation,themagneticheadinstalledonthesurfaceofthedrumcompletesthedataaccessandread-writeworkduringtherotation.Themagneticheadmaintainsaninclinationangleof15degreeswiththetapeduringreadingandwriting,andthetracksarearrangedinparallelonthetapeataninclinationangleof75degrees.Usingthisread-writetechnologycanobtainmoredatachannelsonthesametapearea,makefulluseoftheeffectivestoragespaceofthetape,andthushaveahigherdataaccessdensity.
Технология за четене и запис на линеен запис:
Thetaperead-writetechnologyforreadingandwritingdataonthetapeinalinearrecordingmodeisbasicallythesameasthatofataperecorder,paralleltotheheadThehigh-speedmovingmagnetictapeskimmedthestationarymagneticheadfordatarecordingorreadingoperations.Thistechnologycanmakethedesignofthedrivesystemsimple,andthereadandwritespeedislow,butbecausethedatarecordingtrackonthetapeisparalleltobothsidesofthetape,thedatastorageutilizationrateislow.Inordertoeffectivelyimprovetheutilizationrateandread/writespeedofthetape,peoplehavedevelopedamulti-headparallelread/writemethodtoincreasetherecordingdensityandtransmissionrateofthetape.However,thedesignofthedrivehasbecomeextremelycomplicatedandthecosthasalsoincreased.
Технология за цифрово линейно изкуство:
DLTisanadvancedstoragetechnologystandard,including1/2-inchtape,linearrecordingmethod,andpatentedtapeimportKeytechnologiessuchasdevicesandspecialtapecassettes.ThetapedriveusingDLTtechnologyhas128tracksonatapewithatapelengthof1828feetandabandwidthof1/2inch.Theuncompressedcapacityofasingletapecanbeashighas20GB,andthecapacitycanbedoubledaftercompression.
Линейно-пентапетна технология:
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-инчов накрайник:
QIC(QuarterInchCartridge:1/4-inchtape)лента е лента с ширина на лентата1/A4-inch касета лента с касета, наричана още 1/4-инчова лента. Има две спецификации, а именно DC6000 и DC2000. Сред тях устройството на DC6000 лентата е 5,25 инча, което е елиминиран.Устройството на лентата DC2000 е само 3,5 инча, цената на устройството е ниска, стандартизацията е висока и производителите са съвместими един с друг. .
Цифрова аудиокасета:
DAT(DigitalAudioTape:DigitalAudioTape)tape,themagneticbandwidthis0.15inches(4mm),alsocalled4mmtape.Becausethetapestoragesystemusesspiralscanningtechnology,thetapehasahighstoragecapacity.DATtapesystemsgenerallyusewriteandreadandcompressiontechnology,whichnotonlyimprovesthereliabilityanddatatransmissionrateofthesystem,butalsoincreasesthestoragecapacity.Atpresent,thestoragecapacityofaboxofDATtapescanreach12GB.Atthesametime,manymanufacturersofDATtapesanddrivesareapromisingdatabackupproduct.
8 mm лента:
Itisalarge-capacitytapethatisonlydevelopedbyExabyteandissuitableforlargeandmedium-sizednetworksandmulti-usersystems.The8mmtapeanditsdrivealsousespiralscanningtechnology,andthetapeiswider,sothestoragecapacityisextremelyhigh,themaximumcapacityofatapecanreach14GB.Butthebrandissingleandtherearefewertypes.
1/2 инча лента:
ThistypeoftapeisdividedintoDLT(digitallineartape)tapeandIBM3480/3490/3590seriestape..DuetotherapiddevelopmentofDLTtapetechnology,ithasbecomeanimportantstandardfornetworkbackuptapedrivesandtapelibrarysystems,andbecauseofitslargecapacity,highspeedanduniquedevelopmentpotential,ithasbecometheleaderinmediumandhighbackupsystems.DLTtapeshaveacapacityofupto35GBpercartridge,andthecostperunitcapacityislow;IBM3480/3490/3590seriestapesareproducedbyIBM,andthestoragecapacityofeachcartridgecanreach10GB.Thecorrespondingdrivesystemisactuallyatapelibrary.Storemultipletapes,anditsmanipulatorcanautomaticallyselectanyoneofthemtothedrive.