I've used my flash drive many times to watch movies off my 360. I recently got in the mood to watch some tv shows and because of how much it was I put it on the hard drive to make it easier than by having a season at a time on the flash drive. I plugged it in and it didn't register it. So I tried the other USB slot and nothing. Restarted xbox and still nothing. I went online and found a bunch of people who had the same issue but the only thing I found was something like "if it's not from microsoft it won't work". Which doesn't make any sense because my flash drive works fine. Has anyone else had this issue or know how to fix it?