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Hard disks

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Hard Disks

Hard Disks

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  • 1. HARDDISKS
  • 2. Hard disks store digital information in a relatively permanent form.
    Data are stored in thesurface of eachplatter in sectors and tracks. Tracks are concentriccircles and sectors are pie-shapedwedgesoneachtrack.
    Hard disksgivethecomputertheabilitytorememberinformationwhenthepowergoesout.
  • 3. Thisis a typicalhard disk drive. We are goingto open it and look inside.Do not open it at home! Opening a hard disk ruinsit!
  • 4. Attachedtoonesidewefindtheelectronicsthat control thereading and writingmechanism and the motor thatspinstheplatters.
    Underneaththeboardthere are connectionsforthe motor thatspinstheplatters. Thereisalso a ventholethatletsinternal and external aire pressuresequalize.
  • 5. These are theplatters and thearm. Theplatters spin at 3,600 to 7,200 rpm. Thearmholdstheread/writeheads and iscontrolledbythemechanism in theupper-leftcorner. Thearmmovesfromhubtoedge and back up to 50 times per second.
    Themechanismthatmovesthearmisincrediblyfast and precise
  • 6. Hard disks havemultipleplatters in ordertoincreasetheinformationthey can store.
    Thishard disk has threeplatters and sixread/writeheads.

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