Abstract
This chapter discusses various data storage and compression techniques. Acquired data must be permanently stored by the personal computer to allow future retrieval for display and analysis. The conventional storage devices available for personal computers use magnetic media. A file is a logical grouping of data, physically stored on a magnetic disk or other permanent storage media. The physical structure of a disk consists of concentric rings, called cylinders, and angular segments, called sectors. The physical structuring of a disk into cylinders and sectors is produced by the DOS FORMAT program. To access a file via DOS, the path to the directory containing that file must be specified, usually starting from the root. Standard DOS file types are denoted by a three-letter extension to the filename.
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