MAGNETIC DISK, These consist of one (1) or more flat, circular platters made of glass, metal, or plastic, and are coated with a magnetic substance., OPTICAL DISKS, These are an alternative to magnetic disk storage., RANDOM ACCESS, It is possible to get to the required item directly., SOLID STATE MEMORY, uses volatile memory as a means of holding and accessing data., MAGNETIC TAPES, Like other magnetic media, tape is nonvolatile, and, under proper storage conditions, the data can be stored indefinitely., SERIAL ACCESS, When reading a data item, all previous items have to be read or skipped..

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