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UNIT II-STORAGE DEVICES AND NUMBER SYSTEM (SECONDARY MEMORY (PUNCH DEVICES…

- - - - -data stored in magnetic form
        -affected by magnetic field
        -has high storage capacity
        -doesn't use laser to read/write data
        -devices are: hard disc, floppy disc, magnetic tape
    - - -data stored in optic form
        -not affected by magnetic field
        -has less storage than a hard disk.
        -uses laser to read/ write data
         -data accessing is high compared to a floppy disc
        -devices are:CD-ROM,CD-R, CD-RW, DVD