At this point I think I will hold off on purchasing Win7 until the actual retail copy arrives and the installation rules has been explained/confirmed . I have a retail XP on one esata drive and an OEM Vista on another esata drive . I want to prep the Vista disk but hesitant due OEM license with a near mb upgrade in the horizon . The XP disk I don't want to touch as it is fully working with everything and continues to be my workhorse . I am hoping Win7 will be like xp installation , where it just ask for the old cd(Win Me)that was the best ever .