Just got vista working on another HD which is set to master on the jumper. I have WinXP on the other, and I don't want to mess it up by using both drives at the same time, but I want to use both drives so as I can copy over some programs onto the vista hd. So, if the vista one is set to master, and I just unplug the jumper in the other hd, if I boot with them both connected, the vista os should load, the other one will just show up in my PC. Is that right? That's what I want to do anyway. provided it works.