So, a few weeks ago, I decided to do a little early spring cleaning. I deleted all of the stuff associated with Fallout 3 and New Vegas. I went back to re-install the game and it's DLC, but discovered that I had purchased all of the dlc except The Pitt and Operation Anchorage. I was confused by this when I remembered that way back before the GOTY edition came out, I had purchased a separate disc that contained The Pitt and OA, but last year I had sold the disc, completely forgetting that I hadn't purchased them on the XBL Marketplace. This evening I took the dlc disc that came with the GOTY edition, and popped it into my 360. The console tried to read the disc, but it would not recognize the disc. I checked it three times. The underside was clean and there were no scratches. I ended up having to purchase the two dlcs, which wasn't that big of a deal, but still.