I think I know the answer to this but I just could do with confirmation.
I've been using Ritek discs for making my backups, the first 25 were great and not a single problem. So I ordered 100 more of them thinking they would be fine. Now, out of the first 25 of the new batch I have had a lot of bad writes, games which aren't recognised by the 360, games which boot then get stuck at the loading screens... Looking at the disc it seems to show finger print marks which wont come off, closer looking, to me, looks like it hasn't burnt to a few small places close together and is not actually a finger print, would this be right?