Thanks chef & tubebar,
I have a new macbook pro w/ 10.6 [first mac] and an older thinkpad x41 w/ winxp tab ed sp3. I need to burn CD/DVDs that can be read by either. I'm trying to find burning software for the mac to do multisession and that saves compilations. When reading about what different software did they mentioned "hybrid" cd's when talking about pc/mac compatibility so I googled hybrid. One definition was that it contained multiple file systems for windows & mac. At one time I had optical disc file systems and formats straight, but now I don't.
Previously I mostly burned using nero and 9660 on my pc's. I thought 9660 was os-independent [you lost some metadata from ntfs volumes], but now I see there are apple extensions for 9660, I guess the extensions make it possible for macs to read files burned on 9660 on a mac [mac must need the metadata retained to read the file] and the 9660 makes it possible for a pc to read the disc?
I've been able to read my pc-burned dvds that are sealed or one session on the mac. Some dvd multisessions haven't been readable by the mac - don't know yet if all multisessions will be a problem because multisessions dvds aren't sealed. At least nero didn't have that option when burning MS dvds. So I'm guessing that mac can read files from an ntfs volume burned on 9660, but for files from an HFS+ volume it needs the extensions used. Or maybe the extended journaled format no longer requires the extensions to read 9660 files from a pc or a mac.
Either way, I'd think mac burning software would automatically burn "hybrid" cd/dvds.