Hi, I currently have XP and OS X sharing a 500gb drive. I was thinking about adding an additional HD and installing Vista (the rtm version) on it. Is this possible? I've read suggestions of just unplugging the default drive and doing a clean install of vista on the new drive. Can I hold down the Alt key on bootup and select between 3 operating systems? Thanks Ps. If this is possible I'm going to go out and grab a 250gb+ drive. Does anyone have any suggestions on a quiet but good performing drive?