I have used windows xp with parallels 5 for several years on my MacBook. We are upgrading to a MacPro and wondered about installing a second HD in the machine that would run windows 7 only. The question is, could we have parallels running that would allow us to have Lion on one drive and parallels running to access the windows OS on the 2nd drive? Or does the Windows install have to be on the 1st drive in order to run in parallel?