Specifications

CD-i FAQ 2000 Edition Revised February 21, 2001
Latest version and more CD-i info: http://www.icdia.org
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Sometimes it's also called Enhanced (Music) CD. The logo is made up of the regular CD-Digital
Audio sign with a '+'-mark next to it. The standard is described in the Blue Book.
Such a CD-Extra is a so called "stamped multi-session" disc. It is in essence a multi-session disc
like the ones you can create with your CD-Recorder, with the music in session 1, and the data in
session 2. Every ordinary CD-Audio player can only read the first session and it will play the
music without the risk of playing back the noisy data. A computer with a multisession CD-ROM
drive (all drives manufactured after 1992) can access the data in a normal way. And this is were
the CD-i "problem" comes in: since virtually all CD-i playes (with the exeption of some older
professional models) contain a multi-session drive, the player reads the latest session (which it is
supposed to do according to the multi-session specification) where it wouldn't find any CD-i data
nor audio-tracks. As a result, the disc will not play. The CD-i player is too smart to fall for the CD-
Extra trick! This problem can not be solved in any way :-(
Remeber that a CD-i player can play the CD-Audio tracks of CD-ROM discs that contain the CD-
ROM data as a regular track. Look for the CD-Extra (CD-Digital Audio+) logo on a disc to verify
wether it is a true CD-Extra disc and hence not usable on a CD-i player.