Strangely enough, when I first inserted our Call of Duty 2 disc into the Xbox 360, we got an error stating that the DVD would only be playable on the Xbox 360. Basically, either the disc didn’t realize that it was in an Xbox 360 - or the Xbox 360 didn’t realize that it was, in fact, an Xbox 360. Huh. A quick reboot fixed it, but this is curious nonetheless.