I've been converting 8mm movies to DVD and all was fine until I used up my last -R 4X disk. Bought Kodak -R 16X and then Sony -R 16X and neither brand will write. The disk ejects after a "writing lead out" message. I've flashed the most current firmware on the drive... got to be something about the shift from 4x to 16x as this happens on all DVD burner software. Running XP. Any ideas?