Ok so I have a 360 that sits horizontal. My buddy who is staying here for a bit has his 360 set vertically. Last night he kept getting a disc read error message while playing Rainbow 6 Vegas. He'd restart and then go back in. This happened about 4 times when he decided to take out the CD and there it was...this rather deep (something I can stick my nail in) and about 1cm wide sort of scratch all the way around the disc! It's as though someone spun the disc and stuck a hard point against it and just let it go. It's bad and of course he's not about to try another game out. He seems to think the 360 can't be vertical, most who have a 360 seem to know it not only can be, but they have those cooling stands that are for vertical placement. I'm wondering if anyone knows what may have caused this. The game and xbox were bought at Game Stop (EB Games) so he's going to go in and see if they can't replace the unit and the game but we're still curious.