I have a couple of programs that can only be run on a Windows PC. I'm guessing this is not a new question because many people are skeptical about getting infected with some sort of virus once you run Windows on a Mac. So I was wondering if I can dedicate a external HDD to Windows use and actually have some kind of option when I boot the mac as to whether I want to boot into OSX or WindowsX and if I choose "Windows" it will defer to the external HDD and my screen will basically look like a Windows 7 machine. I also wondered whether it would be better (safer) to do this as opposed to say using Parallels and dispensing with the external HDD? BTW, if I install Windows, I would not be using it to browse on the web, but purely to run these three programs. However, one program is an online application that is used to program a remote control (Acoustic Research AR-RX18G XSIGHT Touch). The other programs are Corel Draw and MS Visio. My MBP has a solid state drive... and I think I have heard where some people have put two (2) of these inside the machines. That seems like a very expensive solution, but would that be better?