CD Extra

Developed by Royal Philips, Sony Corporation, and Microsoft Corporation as defined in the "Enhanced Music CD Specification" ('Blue Book') first published in 1995. It is a multisessionMultisession Compact Disc, hybrid CD-ROM XACompact Disc Read Only Memory eXtended Architecture / CD-DACompact Disc Digital Audio disc format created by storing CD-DACompact Disc Digital Audio tracks in the first session and CD-ROM XACompact Disc Read Only Memory eXtended Architecture data tracks in the second session. Standard CD-DACompact Disc Digital Audio players will read the first session as if it were a standard 'Red Book' Audio CD, while compatible computers can read the CD-ROMCompact Disc Read Only Memory session. CD Extra (also known as 'CD Plus', or 'Enhanced Music CD') should not be confused with the generic term Enhanced CDEnhanced Compact Disc which refers to all types of hybrid Audio/Data CDs.