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Meaning of GROUP CODE RECORDING

 
Computing Dictionary
 
 Definition: 

(GCR) A recording method used for 6250 BPI magnetic tapes.

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.

GCR is also used on commodore business machines diskette 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.

Compare nrzi, pe.

 

 

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