Hi this is my simple tutorial on how to save you $5
Basically your playing MW2 some noob comes in knifes you 'you' spazz out and start jumping around your mummy comes in and tells you to calm down so you start playing again and BOOM you get noob tubed. Well heck you chuck your controller on the ground your Xbox moves and Kapow your Disk has got a circle around it after following 3 main steps

1) Clean the disk
2) Put the disk back in
3) This does not work

You will need to

1) Borrow the game from a Video Store or a friend who has MW2

2) After you have got the MW2 disk you need to insert it into your Disk Drive, When on the Dash board you see the "MW2 Play now" and your avatar so your going to go one D-pad to the Right and it should say "Game Library" Your gonna press 'A' then it should display "Recent Games" so in that section there should be MW2 press 'A' again and then it will bring up a menu like 'play game' and what not . So your going to click "Install game" most games should take 3gigs of space so not to big and surely worth spending that $5 on a monster. After installing were moving to the next step.

3) The final step is to run the game back to the video store or your mates, Then when you return home basically put your 'Scratch' MW2 disk into the DVD drive and just play the game there will be no error for ever. Unless you like smash the disk to pieces when you get knifed again.
Enjoy Play MW2 with a monster energy drink Quick scoping in terminal with your buddys

It's really worth it over buying a new Laser or what ever. So yeah. Enjoy

THIS WILL WORK WITH EVERY GAME