I want to use my Macbook pro formatted 500GB external harddrive with my Xbox 360 to display various media on a TV, but to do so I have to supposedly erase the contents whenever I connect to said 360 and reconfigure. I put the now-erased xbox formatted external into the macbook and it says I have to erase the xbox format from it. I know theres a may to do this correctly and have the external work on both devices. Any help would be appreciated. Thanks.