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Hard disk drive

  1.       

    commonly referred to as a hard drive, hard disk or fixed disk drive

  2.       

    also known as HDD

  3.       

    stores digitally encoded data on rapidly rotating platters with magnetic surfaces

  4.       

    is a non-volatile storage device

  5.       

    have expanded beyond computers to include digital video recorders, digital audio players, personal digital assistants, digital cameras, and video game consoles

  6.       

    s can store much more data than floppy disk drives and access and transmit it faster

  7.       

    manufactured by Seagate ( Maxtor ), Western Digital, Samsung and Hitachi

  8.       

    any contamination of the read-write heads or platters can lead to a head crash

  9.       

    can be calculated by multiplying the number of cylinders by the number of heads by the number of sectors by the number of bytes/sector (most commonly 512)

  10.       

    record data by magnetizing a ferromagnetic material directionally, to represent either a 0 or a 1 binary digit

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