Optical Data Storage
This paper reveals that the distribution of audio information in disk format sound stored as modulations in a at surface has had a long and successful track record. At first, analog signals were imprinted on shellac and then later vinyl platters. But recently, sound has been almost exclusively distributed as and replayed from digitally encoded data, molded into the surface of compact polymer disks. This migration was driven by consumer demand, i.e., higher bandwidth in recording, replication and playback, which in turn required dramatic increases in the amount of stored information.