Ugh Xbox drives me up the wall with their "ownership" scheme. A disc doesn't actually contain the game, It's a _license_ for the game. When you insert the disc, your Xbox downloads the entire game to its drive, but the game won't launch without the disc inserted.

It's the worst of both worlds. After the Xbox store shuts down, none of your discs will work because they don't _do_ anything. And you can't even launch the game without messing with discs because you can't rip the license from the disc- it MUST be in the machine to launch.

At least you can still sell the disc. For now...