Concept
Thetracksonthediskareasetofconcentriccircleswithdifferentrecordingdensities.Magneticsurfacememoryisacarrierofdifferentshapes(suchasdiscs,ribbons,etc.)coatedwithalayerofmagneticmaterial.Whenworking,itreliesonthehigh-speedmovementofthecarryingmagnet.Themagneticheadperformsreadandwriteoperationsonthemagneticlayer,andtheinformationisrecordedinOnthemagnetosphere,thetracksofthisinformationaretracks.Thetracksofthediskareconcentriccircles.Seethepictureontheright.Thetracksofthetapearestraightlinesalongthelengthofthetape.Thesetracksareinvisibletothenakedeyebecausetheyareonlysomemagnetizedareasonthedisksurfacethataremagnetizedinaspecialway.,Theinformationonthediskisstoredalongsuchtracks.Adjacenttracksarenotclosetoeachother.Thisisbecausewhenthemagnetizationunitsaretooclose,themagnetismwillaffecteachother,andatthesametime,itwillbringdifficultiestothereadingandwritingofthemagnetichead.Anold1.44MB3.5-inchfloppydiskhas80tracksononeside,andthetrackdensityontheharddiskismuchgreaterthanthisvalue,usuallytherearethousandsoftracksononeside.
Relatedcontent
Thephysicalstructureofaharddiskisgenerallycomposedofamagneticheadandadisk,amotor,amaincontrolchip,andacable.Whenthemainmotordrivesthedisktorotate,theauxiliarymotordrivesOneset(head)isplacedonthecorrespondingdiscanditisdeterminedwhethertoreadthefrontorbackofthedisc.Theheadissuspendedonthediscanddrawsacirculartrackconcentricwiththedisc(Magnetictrackorcylinder),atthistime,themagneticinductioncoilofthemagneticheadsensesthemagnetismonthedisksurfaceandusesthereadtimeordataintervalspecifiedbytheharddiskmanufacturertolocatethefanAreatogetthedatacontentofthesector;
Track
Whenthediskrotates,theheadIfkeptinoneposition,eachheadwilldrawacirculartrackonthesurfaceofthedisk.Thesecirculartracksarecalledtracks.
Cylinder
Inadiscgroupcomposedofmultiplediscs,therearedifferentdiscfaces,butAcylindricalsurface(Cylinder)composedofmultipletracksinthesameradiuscircle.
Sectors
Eachtrackonthediskisequallydividedintoseveralarcs.ThesearcsareSectoroftheharddisk.Thefirstsectoroftheharddiskiscalledthebootsector.