Every DVD I have compiled and written is unreadable in any drive except my DVD-R drive (Pioneer A04). Suddenly it made a really good version of Black Hawk down but only worked once. Doing a 1 to 1 copy of this apeared to work but the copy was unreadable. Done abot 20 coasters. The one that worked was done in GEAR DVD Pro 6 but I think something changed cos it made 2 copies and then died. Please help!