CompuServe Messages

1) PhotoCD are Bridge format, not ISO 9660. Bridge format is close to ISO 9660, but has extensions to handle appendable CD. An ISO 9660 driver can only read the data that was written in the first recording session. You need a Bridge Disc format driver to read data that has been written in any following sessions. 2) CD-I is CD-I format, not ISO 9660. CD-I uses a mutant form of ISO 9660 that is real close to ISO, but different enough that many ISO 9660 drivers probably couldn't read it. A bigger problem with reading CD-I discs on some CD-ROM drives is that th data tracks on a CD-I disc are not included in the discs Table of Contents. The Table of Contents is a list at the beginning of every CD that lists what tracks are on the disc and what format they are. That's how your audio CD players can tell you how many songs are on your CD: it reads the Table of Contents. On a CD-I disc, the data tracks are left off of the TOC. Another big problem is that CD-I discs use a different sector format than ordinary CD-ROMs. Last and not least, CD-I discs have special Audio sectors that are designed to be played by dedicated sound hardware in the CD-I player. That could be overcome, but combined with the other problems I mentioned, it's unlikely that anyone will go through the effort of writing a driver soon.