Using a less than official memory unit with your Xbox 360? Then you'll probably want to get your act together before diving into the upcoming preview program for the latest 360 update, as it will apparently lock out any "unauthorized" memory units as it adds all those nifty Facebook, Twitter and Last.fm features. That word comes straight from none other than Xbox Live's Major Neslon, who also warns anyone using said memory units that they'll basically be flat out of luck if they update before backing things up to an of
