The Hard Disk Drive of a Computer is a storage device that has the ability to retain information even if a computer is not turned on. Data is recorded in a metal platter that has a magnetic surface. These devices were introduced by IBM in 1956 for the purposes of data storage. In the 90's the use of HDD's (Hard Disk Drives) were expanded outside the fields of computer technology and applied to camcorders, cellphones, digital video players and recorders, PDA's (Personal Digital Assistant) and video game consoles.
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