TeraIIDX

Every single time I restart my xbox it makes me reinstall the multiplayer to my flash drive. I suppose this is because I'm using a 8gb flash drive and not a 16gb? Don't really understand why this happens, I had to reinstall it twice to the flash drive to just to find out it happened again next time I restarted. I don't understand how I can install it and play multiplayer for hours, but shutting off my xbox makes me have to reinstall disc 2 again