I purchased Call of Duty Advanced Warfare last week and my XBox 360 will not allow it to download. I even purchased a 1T external hard drive. I was on the live chat earlier today and the rep said that the game would not run on an external hard drive. I found the box that my XBox console came in and it only has 4GB and after watching Youtube I discovered that there is a "compartment" that holds a hard drive and when I open it, it's empty. I never knew it was even there. I'm not understanding why the game won't download its components to the external drive that I just paid good money for. There is a hard drive for the console that can be bought for $109. Can anybody give me any suggestions so that I can actually play my game?