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.
- CD-ROM Red Book
- CD-ROM Yellow Book
- CD-ROM XA
- CD-ROM Green Book
- CD-ROM Orange Book
- CD-ROM White Book
- CD-ROM Blue Book
- CD-ROM Purple Book
- CD-ROM CD-I Bridge
- CD-ROM Photo CD
- CD-ROM File Systems
- CD-ROM Manufacturing
- CD-ROM The Disc
- CD-ROM Operations
- CD-ROM Digital Audio
- CD-ROM CLV
- CD-ROM CAV
- CD-ROM Applications
- CD-ROM Interfaces
- CD-ROM DMA vs. PIO Mode
- CD-ROM TrueX Technology