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group code recording (GCR)

Group Code Recording (GCR) is a block-oriented algebraic error correction code that can be used to eliminate errors caused by short voltage spikes. The GCR method is used in tape drives such as the QIC drive

, among others.

Data conversion to GCR code

Data conversion to GCR code

In GCR coding, the data is divided into 4 bits and coded into 5-bit words using a table of values. Thus, half bytes are converted into 5-bit bit patterns. The parity check has one parity bit for every eight data bits.

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Englisch: group code recording - GCR
Updated at: 24.01.2013
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