strange problem here. i have had complete success with all of my backups since purchasing anydvd/cd clone a month ago, until disc 4 of planet earth; quits writing at 49%, giving the cyclic redundancy error message. the disc had never been played before (but when tested, plays fine). cleaned it anyway, same thing. here's the kicker: my dad has the planet earth series also, factory sealed, never viewed, and when i tried copying his disc, it stalled at the exact same spot on disc 4. discs 1,2,3 and 5 copied perfectly. any thoughts? many thanks.