@Dragster
I guess that when you talk about DVD's you mean the recorded that you can buy in video stores.
A video DVD use both ISO and UDF filesystem. The ISO filesystem only supports 8.3 names and where adapted to reduce the development cost of the first generation DVDs.
UDF filesystem is the standard filesystem for all kinds of DVD media and also for CD-RWs.
There are one driver on Amiga that is supposed to read UDF formatted discs. It's named Allegro filesystem from Elbox.
You can also wait for OS4.0 that claims atleast to be able to read UDF formatted DVD-ROMs. If it support writing. (drag and drop) I don't know, but it looks like it might.