I'm backing up some DVD's on my DVD +/- burner. I'm using DVD -R media. (after experimenting the DVD + R was not copying very well) The strange thing is that my copies are inconsistent. Some copies will work perfect and then the next copy I'll get a Disc at Once write error at the end. All use the exact same file, unaltered etc. There's no set pattern to when the error will occur. I've followed the tutorials on this site for the burning and on some of the burns I'm getting an error. It says the burn failed with Disc at Once...I have no idea how to correct the error. The odd thing is that a few of the discs with the error seem to work fine anyways...a couple of the discs with the error however have a bit of a freezing/skipping problem that's minor and only periodic. I'm assuming this problem is the result of the error but can't verify that for sure. The computer I'm running has a newer burner (4x but I only burn at 2x because of the media I have) the computer itself is also a solid machine. I do tons of work on it and the computer itself has handled all large jobs very well (I work in broadcasting so the stuff I'm doing is not pirating or anything of the like) Any suggestions on how to eliminate this problem?