Basically, I want to keep Mountain Lion on my MacBook Pro's hard drive only, I don't want to partition the drive to install Windows 8. I'm already using Win7 and WinXP in Parallels Desktop occasionally, but here's the deal. I am forced to use my Mac for work. I want to keep my personal and work stuff completely separate. My work requires the use of Windows, hence Win7 in Parallels. But it is not always efficient way to do things. What I am considering is this, if it works: I want to install Win7, preferably Win8 on an external drive, perhaps using bootcamp or some other method, so that I can boot my Mac to windows, and without sacrificing any more of my valuable internal hard drive space. Can this be done? If so, how?