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Storage.ppt(lowerskl)

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Transcript

  • 1. Please be Quiet
  • 2. Secondary Storage Devices
  • 3. Secondary Storage
    • Secondary storage (or external memory) - is not directly accessible by the CPU. Secondary storage does not loose the data when the device is powered down and is typically less expensive than primary storage. Data is kept for a longer time in secondary storage.
  • 4. Types of Secondary Storages
    • Magnetic Tape
    • Hard Disk
    • Floppy Disk
    • Optical Disk
    • CDs (Compact Disks)
    • DVDs ( Digital Versatile Disc  or  Digital Video Disc)
  • 5. Magnetic Tape
    • Magnetic Tape – is used for storing large amount of data and it is cheap. It comes in the form of a reel or cartridge and is made of plastic that is coated with a metal oxide.
  • 6. Hard Disk
    • A hard disk is part of a unit, often called a "disk drive," that stores and provides relatively quick access to large amounts of data. Computers typically come with a hard disk that contains gigabyte s of  storage
  • 7. Floppy Disk
    • Floppy Disk – (or diskette) is a removable disk that everyone is familiar with. Since it has a small capacity, it is typically used to store documents so that they can be used on more than one computer.
  • 8. Optical Disk
    • Optical Disks are read using laser beams and stores data in tracks. Optical discs are most commonly used for storing music (e.g. for use in a  CD player ), video (e.g. for use in a  DVD player ), or data and programs for  personal computers
  • 9. CDs (Compact Disks)
    • CDs - is an  optical disc  used to store  digital data . It was originally developed to store sound recordings only, but later it also allowed the protection of other types of data .
  • 10. DVDs (Digital Versatile Disc or Digital Video Disc)
    • DVD , is an  optical disc   storage  media format, and was invented in  1995 . Its main uses are video  and  data  storage. DVDs are of the same dimensions as compact discs ( CDs ), but store more than six times as much data.
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  • 16. SORRY That’s all folks