To all the people that have had rings on their Call of Duty: WaW disc. Its not your xbox. I was talking to my friend today and he said a couple days ago he got a ring on his disc. So yesterday he took it to the store he bought it from. Exchanged it, than opened it in the store. There was another ring on that disc, hasent even been played yet. The store worker opened 10 cod 5's and they finally found one without a ring in it.
So its not your xbox, its the bad making of the disc by Treyarch.