The invention of the Compact Disc format that we know and love today is dated to around 1980 when Philips and Sony settled on the ‘Red Book’ standard, specifying a 120mm optical disc containing 2 channels of digitally encoded audio, with 16bit values sampled at 44100Hz. The format could store 74min-80mins of music on a single disc which was almost double capacity of a typical long playing record.