Nope nothing matters except if you try to play a backup online whetherr on the disc or HD, or if you try to modify a game and cheat (like H2). Other than that you'll be fine if you follow the above instructions. And I think Krayzies would block you from trying to take a backup online, so you'll be fine. *Note you can use the same gamertag as long as it hasn't been banned at all, if you were banned for a HD upgrade in the past, using that same gamertag will get you banned if you have anything other than a stock virgin HD.