I keep getting a:"Burn process failed at 4x (5,520 kb/s)" when I use a DVD-R (Maxell 4.7 gig). I can burn the compilation on a DVD+R. Why can't I burn on a DVD-R. I am using a Sony DW - U12A burner even if I try it a 2x burn speed I get the same error. Please advise. Thank You.