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Low-density digital recording on magnetic tape, in one form or another, has been used for many years, mostly in data-processing applications such as computer input and output, and, more recently, in storage of complex computer programs. On the other hand, high-density digital recording is a relatively new technology, used mostly in data acquisition, in cases where highly significant data are digitized and recorded in digital form at the source, and the quantity of data to be recorded per unit of time makes it impractical to use lower density recording techniques. Such data-acquisition applications range from space probes and satellites to less complicated earth-borne testing. Also, it is not inconceivable that, with the proper input and output interfaces, high-density digital recording might some day provide more efficient means of computer data storage.
Date of Publication: May 1975