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DOS and Disks

RAM is volatile storage. As soon as the power goes off, RAM goes to sleep. ROM provides a permanent storage medium, but you can't write files to ROM. What is needed is a third method of storing data and programs. DOS stands for disk operating system, so if you get the notion that disks are used for permanent storage of data and programs, give yourself the afternoon off.

One of the major functions of DOS is to facilitate the reading and writing of data stored on disks. Disks are circular platters of plastic or metal coated with a magnetic emulsion similar to that used to produce cassette or video tapes.


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