CD Data Format and Disc Standards
CD Data Format
Compact discs use a special format to encode digital data. There is not a direct correlation between a bit and a pit in optical storage. Optical drive optics are not sufficiently precise to read and interpret each individual pit as a bit. Laser beams are focused into a spot approximately 1 micron in diameter so they can miss pits that are 0.83 microns wide. The solution was to devise a coding scheme that bundles user data with error correction and synchronization data into a symbol called ...