CompuServe Messages

Hi Matt, as I think I haven't explained it correctly to Kelly Fraser, here is a new try: Let's assume two "multi-session" CD-ROMs: the Kodak Photo-CD and the one written on a CDD521 with a normal ISO-Formatter like Philips' CDWRITE or WIN-On-CD (which I'd like to call "multi-partition" as I found out that "multi-volume" is alredy used for something different). Both are written on the same machines (PCD-200 = CDD521). Kodak: First session is ISO9660. If a session is appended the directory is written for ALL previous sessions. This makes the CD-ROM look like one big CD. As the naming convention for the PCD-Files is IMAGE.xxx (where xxx is a number) there are only unique filenames! Trying to read a multi-session Photo-CD on a single-session drive you'll see probably only 5 images while the multi-session drive shows more. The drive must only search the last session and gets the latest directory for all sessions. This speeds up the access but you can't use identical filenames in several sessions. This is not important for the imgaes right now, but how if there'll be the possibility to add sound and data and… PHILIPS: First session is ISO9660. The next session is written as a CD-WO (Orange Book Part II). The directory contains only the files in this session. That's why you can write a couple of adjacent sessions containing exactly the same files with the same filenames!!! A session on the CDD521 has to be selected by a program and the session appears as it would be a sole CD-ROM. It's a kind of "window" within the whole CD-ROM. As both formats differ in how they handle the file structure of additional sessions the question is: Does KODAK's format or PHILIPS' format comply to Orange Book Part II ? Any ideas ? I hope this time it's understandable <G>. Bye, Torsten