To save precious SSD space on my rMBP, I'd love to be able to install Windows externally for all my gaming needs, on a USB 3.0 drive. Is it possible to do it that way at all? I've seen various workarounds, but all the guides are really outdated and rely on Windows XP. I've also read that a straight install via BootCamp isnt an option as OSX doesnt let you install to external partitions directly. Other workarounds involve removing the hard drive or installing OSX to the external drive first and booting from there. Thanks in advance.