When I go to battlefiled 4 it says a 2GB xbox 360 hard drive is required so I went back to my hard drive and deleted a bunch of stuff so that there was now more than 2GB and went back to battlefield. Then I pressed OK and pressed my hard drive and it said 'Device not allowed" I really need help on this!!! Dieing to play BF4
What model of Xbox do you have?
You need to have an Xbox with a Hard Drive to play Battlefield 4, you can see some further details here.
If you have the 4GB Xbox slim, then you will need to purchase an Xbox Hard Drive before you will be able to play the game.