I just built a Vista 64 system and still need XP for some things. I want to have two different drives for this. How do I set it up so that I can run XP or Vista? Do I have to change the boot order in the bios when I want a different OS? Will I be able to choose which HD XP will go on when I load it? Can this set up cause problems with the bios? Can I just plug one in and unplug the other as needed?