Hello there people, with the release of Battlefield 3 I thought it would be a great time for me to expand my Xbox slim 4GB to a 250GB capacity. I have just recently purchased an used 250GB slim compatible HDD from Ebay that is said to be "MS Official", my question is this, How can I be able to tell if the HDD is an official MS one? and also Is there any problems on having a non official HDD? Just a little concerned over this. Thanks for the help!