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An [Acronym] for Hard Disk Drive. The component that permamently stores programs and files while the computer is off. A typical cheap [IDE] hard disk drive these days might cost around NZ$200 for 40-60 Gigabytes(Gibibytes?) of data. This photo is of a disk platter used at StanfordUniversity in the 1960s: [http://www.cs.waikato.ac.nz/~jrm21/images/platter-lowres.jpg] I put a $1 note in the lower-right corner to give you an idea of the platter's size. This platter could store 4 megabytes of data. The black mark around it is from a disk head crash (!!).
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