Direct Access Compact Disc vs. CD-ROM Reliability Estimates
Babak Tehranchi, Dennis G. Howe · Joint International Symposium on Optical Memory and Optical Data Storage · 1996
The Cross Interleaved Reed-Solomon Code (CIRC) used in CD-ROM for basic error correction/detection consists of two catenated, distance 5 Reed-Solomon codes. These two subcodes, which are called the C1 and C2 codes, have length 32 bytes and 28 bytes respectively. C1 and C2 can each correct any combination ofterrors andeerasures in a given codeword, wheretandeare jointly constrained by the inequality Specific values oftandemay be selected by a decoder when each C1 and C2 codeword is processed. The algorithm used to adaptively select thetandevalues that apply when the C1 and C2 codes are jointly decoded is called the CIRC decoding strategy.