I have been looking into getting a mac for college. It will be my first mac. I realize that I will most likely still need to use Windows for certain tasks. Is there a way to install Windows on an external hard drive then boot up Windows from the external hard drive. I am afraid that my computer will not have enough memory for putting Windows on the Mac. Also, is it possible to partition an external hard drive so there is one portion for Time Machine, one portion for miscellaneous movies/documents, and a portion for Windows to be installed.