Actually, DVD video disks use only UDF (not ISO 9660) - the file system is a subset of UDF called Micro-UDF. However, use of this format does require that the files not exceed 1GB (even though the UDF standard allows larger) and the file must be contiguous.

--Scott

Ah. So much for my guess. Thanks Scott!

The issue I'm having MAY have something to do with 'Joliet'. So far most player don't seem to care but we've found a few where it does stop them playing the DVD or they will not get past the menu.
Actually now one other thing in there, 'the file must be contiguous', I'd imagine copying the files from a HDD to DVD that'd most certainly be the case, but...
Bob.

The authoring software you are using should make the file contiguous when it's written to the DVD. This shouldn't be something you have to worry about.

Joliet simply allows for filenames that exceed the 8.3 format (DVD files are required to be within 8.3).

Thanks for the info.
This may explain a lot of the problems I've been having. It seems that some DVD players will cope with the longer filenames, seems to be mostly the ones with advanced MP3 capability. However I suspect if the specs don't require the players to be able to read Joliet then this is why some cannot cope.
Bob.

farss, get img. tools classic to make ISO and get DVD Decrypter to burn the image.
The best combo, plus it's free.
DVD Decrypter is the ONLY burning app that does dual layer propperly, unless you want to fork out some cash and get Pro burning apps like GearDVD or some Sonic Solutions app.

AudioIvan

Thanks,
I'll look into them. DVDA is fine for what I'm authoring. My only problem is it doesn't do a read after write verify. I make a LOT of DVDs and then in most cases about 100 copies are duplicated by my client. It's a real pain when he has his duplicator say it cannot read the DVD, these ones a time critical.
A few that I do go from me to client to review and then a master copy goes from client to replicator. Big problems if the replicator finds a problem. So to be 100% certain I started using RecordNowDX to burn from DVDA authored folder. Except we've since found some new DVD players that don;t like the DVDs.
I've since realised there's a pretty simple way to verify the disks, copy all the files back to a temp folder, the sector checksums should pickup any errors.
Bob.