Laptop hard drive

Dimensions

Theharddiskusedinnotebookcomputersisgenerally2.5inches,whiledesktopcomputersare3.5inches.Duetothedifferentproductionprocessandtechnicalparametersofthetwo,firstofall,2.5harddisksonlyuseoneorTwodiskswork,andthe3.5harddiskcanbeassembledwithuptofivetowork;inaddition,becausethe3.5harddiskhasalargerdiskdiameter,itcanproviderelativelylargestoragecapacity;ifonlytheareadensitystoragecapacityiscompared,2.5Theperformanceoftheharddriveisalsoquitesatisfactory.Laptopharddrivesareoneofthefewcommoncomponentsinlaptops,andbasicallyalllaptopharddrivesareuniversal.

Thickness

Butlaptopharddriveshaveaparameterthatdesktopharddrivesdonothave,thatis,thickness.Standardlaptopharddriveshavefourthicknessesof7,9.5,12.5,and17.5mm.The9.5mmharddriveisdesignedforultra-lightandultra-thinmodels.The12.5mmharddriveismainlyusedforthickeropticalandsoftinterchangeableandfullybuilt-inmodels.Asforthe17.5mmharddrive,itistheproductoftheprevioussmallsingle-diskcapacity.Basicallynomodelshavebeenadopted.

Numberofrevolutions

Thefastestnotebookharddriveis10000rpm64MCache.Evenifthespeedisthesame,thelinearspeedoftheouterringcannotbecomparedwiththedesktopwith3.5-inchdisk.Comparedwithcomputerharddrives,laptopharddrivesarealreadythebiggestbottleneckfortheperformanceoflaptops.

Interfacetype

Theharddiskofalaptopcomputerisgenerallyconnectedtothemotherboardinthreeforms:theharddiskpinisdirectlyconnectedtothesocketonthemotherboard,andthespecialharddiskcableisusedtoconnecttothemotherboard,orThetransferinterfaceisconnectedtothesocketonthemotherboard.Nomatterwhichmethodisadopted,theeffectisthesame,butitdependsonthemanufacturer'sdesign.

TheinterfaceofearlynotebooksismainlyUltraATA/DMA33,buttheincreaseinthespeedandcapacityofnotebookharddrivesmakesitabottleneckhinderingthespeedofnotebookcomputers.Forthisreason,justlikethedevelopmenttrendofdesktopcomputers,UltraATA/DMA66/100/133hasalsobeenappliedtonotebookharddrives.TheproductusingUltraATA100,E-IDEinterfaceprovidesamaximumtransferrateofupto100MB/swhilefreeingtheCPUfromthedatastream.

SATAserialporttechnologyhasbeenwidelyusedindesktopharddrives,andSerialATAinterfacetechnologyhasalsobeguntobewidelyusedinnotebookharddrives.Usingthisinterface,alltaskscanbecompletedwithonlyfourpins.Theimportantpointofthistechnologyisthatitcanmakethevolumeoftheinterfacedrivecircuitmoreconcise,andthetransmissionspeedofupto150Mb/smakesiteasierformanufacturerstomanufactureminiaturehigh-speednotebookharddrivesthatarelessdependentontheprocessor.

Capacitytechnology

Asapplicationsaregettinglargerandlarger,theharddiskcapacityisalsogettinghigherandhigher.Fortheharddiskofanotebookcomputer,notonlyalargecapacityisrequired,butalsoItssmallsize.Inordertosolvethiscontradiction,theharddiskofthenotebookcomputergenerallyadoptsthemagnetoresistivehead(MR)technologyortheextendedmagnetoresistivehead(MRX)technology.TheMRheadrecordsdataataveryhighdensity,therebyincreasingthediskcapacityandimprovingthedatathroughputrate.Atthesametime,thenumberofheadsanddiskspacecanbereduced,andthereliabilityandanti-interferenceandvibrationperformanceofthediskcanbeimproved.Italsouseshigh-techsuchasenhancedadaptivebatterylifeextender,PRMLdigitalchannel,andnewsmoothheadloading/unloading.

Features

Thereisnoessentialdifferencebetweenlaptopharddrivesanddesktopharddrivesintermsofproductstructureandworkingprinciple.Thebiggestfeatureoflaptopharddrivesistheircompactsize.Itis2.5inches(thereare1.8inchesorevensmaller),andthethicknessismuchlowerthanthatofa3.5-inchharddrive.Generally,thethicknessisonly7mm-12.5mm,andtheweightisaboutonehundredgrams,whichcanbecalledsmallandexquisite.Thesmallinternalspaceofnotebookcomputers,inconvenientheatdissipation,andlimitedbatteryenergy,coupledwiththeinevitablebumpsduringmovement,placehighrequirementsonthevolume,powerconsumption,androbustnessofitscomponents.

Theharddiskusedinthenotebookcomputeris2.5inches,andthedesktopcomputeris3.5inches,andthepriceishigherthanthatofthedesktopcomputer.Asapplicationprogramsaregettinglargerandlarger,thecapacityofharddisksisalsoincreasing.Therefore,whenpurchasingmachines,thecapacityofharddisksshouldbeconsideredforexpansion.Theharddiskisthemostfragileandbreakablepartofanotebookcomputer.Innormaluse,youshouldpayspecialattentiontoshockanddrop,andmakemorebackups.

Butthereisstillahugegapbetweentheperformanceofnotebookharddrivesanddesktopharddrives.Whendesktopharddriveshavereachedthemainstreamspeedof7200rpm,notebookharddrivesarestillonly5400rpm,andharddriveshavebecomeTheperformancebottleneckofthevastmajorityofnotebooks.Inthepursuitofthinnerandlighter,1.8-inchnotebookharddriveshaveappeared.