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A Range of Hard Disc Drives for :

Desktops

Laptops

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A hard disk drive (often shortened as hard disk,?hard drive,?or HDD) is a?non-volatile storage device that stores digitally encoded data on rapidly rotating?rigid (i.e. hard) platters with?magnetic surfaces. Strictly speaking, "drive" refers to the motorized mechanical aspect that is distinct from its medium, such as a tape drive and its tape, or a floppy disk drive and its?floppy disk. Early HDDs had removable media; however, an HDD today is typically a sealed unit (except for a filtered vent hole to equalize air pressure) with fixed media.

http://en.wikipedia.org/wiki/Hard_disc_drive