Purple Book
The informal name for specification produced by Philips and Sony in 2000 to describe their double-density compact disk (DDCD) format, which increases the storage capacity of the disc to 1.3GB through means such as increasing its number of tracks and pits. Purple Book-defined products were released in recordable and rewritable - rather than read-only - formats, and require special CD-RW drives to handle them.
Last Update: Thu Mar 27th 2003