Recorded letters from Iwo Jima the other night and decided to transfer it to a DVD less adverts. Run it through DVD shrink and cut out the ads. Saved each part as part1 - 5 in a separate folder. Opened Nero imported clips and merged title. Done this a load of times before. Few mins later burn process failed!! I can watch each clip so they can't be corrupted. Burned part 1 with Nero, no problems, also burned some data and copied a disc. Starting to bug me a little now. Any ideas ?