> I just wondered if there is some HFS, or other Mac hybrid filesystem, part
> of the Mac format that the MorphOS filesystem isn't seeing to be able to
> mount it as it would a PC or Amiga formatted CD/DVD?

"Most operating systems support reading of ISO 9660 formatted discs, and most new versions support the extensions such as Rock Ridge and Joliet. Operating systems that do not support the extensions usually show the basic (non-extended) features of a plain ISO 9660 disc."
http://en.wikipedia.org/wiki/ISO_9660#Operating_system_support