I just had the latest update (as of 04/01/2014) to my 360 console and after it rebooted I wasn't logged in. I went to Storage and found all the files in my consoles memory had been corrupted! I shut down my console and now all none system files are gone. Luckily, I don't keep anything important on the system drive, but I shudder to think what mess I'd be in if I had! I am posting this not for help, but as a warning to everyone and a heads up to Microsoft. If this just didn't happen to me, some support people are in for a very long and unpleasant day.