In a recent system update to Xbox 360, Microsoft introduced a new change that prevent “unauthorized memory units” from working with Xbox 360. Which has sparked new complaints about the price of official memory devices. A 512MB memory unit from Microsoft costs $29.99, while a third-party 2GB costs $39.99. If you’ve moved your profile or saved games on to one of these third-party units, you must “back it up,” and better move it back on to an authorized Xbox 360 storage device prior to taking the update. If you continue to use an unauthorized Memory Unit after the update, you’ll not be able to access your stored profile or saved games, announced Larry Hryb.