Dvd Burner Problem???

did you know that dvds can be positive, negative, neither or both? even neither and both. that might be something to do with it. look at the burner, not the software, and then look at the disks, are they the same ones you always used. also why does it take you half an hour? are you choosing to do a dvd video, or an iso, you should jsut burn it as an iso if it is an avi or something like that, if it is VOBs then go as dvd video