Cod 6 disc is unreadable - Microsoft Xbox 360 Console

Hey dude my xbox does this all the freaken time...this is just your xbox most likely unless you have a million scratches on the disc....it usually takes me opening and closing the tray ten times before a game works

If it wont read any games its a fault with the laser in the dvd drive, it may just need cleaning with a dvd cleaner disk, or it may need replacing.
If its just the one disk it may be scratched, take it down blockbusters or game station they have a machine that can wash these off, it costs about £2. If you cant be bovvered to walk down the store, use toothpaste, just smear the toothpaste over the disk a couple of mm thick, dont rub just smear, wait a couple of hours then just rinse off with warm water, dont rub just rinse, dry it off and it should work.
Remember thumbs up if this works.