Thanks for the responses so far, sorry if I wasn't clear enough. I try to keep it short as no-one likes a rambler. (That is someone who talks too much, not people who walk places for fun!)
When I said that under windows I see everthing I should have said I see the correct disk contents as listed in the mag. Directories full of stuff like Distros, Apps, Desktop etc. Hundreds of files. When automounted under Suse or Mandrake or indeed if manually mounted using the ISO9660 type from the command line I only see these three small files, and I mean small, I think they list as a few kilobytes.
Obviously the disk is readable during the install as it does just that, but under the booted OS it appears virtually empty. Its very strange.
If no-one else is seeing a similar problem I guess it could be an odd driver issue with the particular DVD drive I have. I'll try and install it on another machine with a different DVD drive and see if the same problem occurs.
Watch this space. ( Only if your interested of course, its not obligatory or anything, and I told you I talk to much, shutting up now