Is you're copy of MW3 notifying you that your disk is unreadable while you don't have any major scratches? Well the issue is a minor bug between your xbox live account and your copy of mw3. Apparently, when trying to play multiplayer under your own "glitched out" account, MW3 disables your ability to play the multiplayer section of the game. It's almost like a ban. The only method, I have yet to find, that can fix this issue can be found below.

Directions:

1. Take out your MW3 disk and clean it thoroughly.

2.(Optional) Open your disk tray and clean the inside of it using air cans/ compressed air cans.

3. Place your copy of MW3 into the disk tray and turn off your xbox.

4. Turn on your xbox once again and navigate to the system settings.

5. Navigate to memory and then press 'Y' to go into your hard drive's settings.

6. Choose to "Clear System Cache" (this will not delete any important files on your hard drive)

7. Now press the xbox button on your controller and sign out of xbox live.

8. Now in order for this to work, you must have a second gold account. I recommend making a 1 month account on your xbox, if you have any left, or just use the 48 hour code provided by Activision in your MW3 case.

9. Once you have a new gold account, sign into to it. You then want to play Call of Duty: MW3 and access the multiplayer menu.

10. Once there, go ahead and play one full Multiplayer match.

11. Afterwards, back out into the MW3 multiplayer menu and dashboard.

12. Once on the dashboard, sign out of your second account and log into your primary account.

13. Go ahead and start playing MW3 !!

If that does not work, then try to install to your hard drive. If that does not work, then it means that you disk is actually scratched or that your xbox's dvd drive cannot handle your mw3 disk. This is because mw3 was burned onto a disk that is 1 gb bigger than what the dvd drives of most xbox's are typically able to handle. Therefore, it would be likely that MW3, Battlefield 3, and many new games, may not even work on many consoles.

I myself discovered this fix after making a new gamertag and going to test out MW3. To my luck, mw3 actually worked and I tried this method out with my other friend who was experiencing the exact same issue. Now both of our games are fixed.

Hopefully you guys found it useful! Don't forget to thank this post if this worked