hi all! my problem is similar:
i drove on vacation to estonia (my home country :) ) and took my files from my computer in austria with me on 2 dvd-rws. my computer there has a dvd burner (duh, since i wrote the data onto the dvd-rws ;) ), but the computer here only has a dvd/cd-rw drive, so it doesn't write dvds. however, since it reads dvds, it should also read dvd-rws. my problem is that it doesn't; it simply does not detect that there is a disk in the drive. i have the same program on this computer that i burned the files onto the dvd-rw with: Nero InCD 4.3.
i read this and the other thread provided by fishily (http://forums.afterdawn.com/thread_view.cfm/202427), but i discovered another possible problem for this: when i put the dvd in and open the properties window, it shows 0 kb of 0 kb size because it simply doesn't detect the disk (the properties window looks exactly the same with no disk inside); and on the tab "InCD", it shows that my drive doesn't support DRT-DM. i've explored quite a few sites in the internet and found out that for the drive to be able to read it, you possibly need a UDF 2.0 (or some similar version) driver. but still i don't know much about this new DRT-DM system.
so please, can anybody help me out and maybe shed a little light on the topic DRT-DM and it's compatibility with and requirements for drives? i'd be very thankful for your help.