I use a NEC ND-2500A DVD+RW and I recently bought a bunch of 16x DVD-R. When I try to burn them I get the message "Illegal disc". I don't have a clue as to whether or not it matters what kind of discs you use, but if there is a limitation, is there some way to work around it, some program or such, or is it simply impossible? Is the only choice to get a newer burner (it would still cost less than the discs I bought ~~)?