I tried to copy a disc today on my Freecom External USB Burner, but it wouldn't play, let alone burn. But, I tried the same with my Matshita DVD-RAM UJ-831S and it worked fine. Could the Freecom not be as 'strong' as the Matshita. By the way the disc did have a few minor scratches on it, but the Matshita seemed to overcome this. Is this common?