chapter  6
15 Pages

CD-ROMs

The original audio based technology was developed by Philips and Sony in the late 1970s and culminated in the issue of the Red Book specification for audio CDs in 1982. The potential application of CD technology as a high-capacity, low-cost medium for read-only data storage resulted in the 1983 Yellow Book CD-ROM specification. Whilst the basic technology remains the same as that for CD audio, CD-ROM data requires greater data integrity: a corrupt bit that is not noticeable during audio playback becomes intolerable with compu­ ter data. In addition to the Red Book CIRC (cross-interleaved ReedSolomon code) standard for audio CDs, the Yellow Book specification addresses the data integrity issue and dedicates more bits for EDCs (error-detection codes) and ECCs (error-correction codes).