I tried using a Thumb drive to transfer MP3 files from my computer to my Xbox 360. The xbox said It had to make the thumb drive compatible with it. It did, but after that I looked at the thumb drive in my storage Devices and there wasn't anything on it. I unplugged it and plugged it back into my computer, and it was that it was empty as well, and when I tried putting the music back into the thumb drive folder, it said there was no room. Any explanation, tips?