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Computing (FOLDOC) dictionary
Group Code Recording
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storage (GCR) A recording method used for 6250 BPI magnetictapes.
GCR typically uses a group of five bits of code to represent
four bits of data, where the encoding ensures no more than two
or three zeros occur in a row, and no more than eight or so
ones occur in a row, where zeros represent an absense of
magnetic change.
drives; the 4040, 8050, 154x, 157x and 158x series of 5.25"
and 3.5" low and high density diskette drives used with 8-bit
home computers circa 1977 to 1992. Also used on Amiga
internal and external drives.