I have just purchased the newest 13'' rMBP and would like to partition 50 gb for some games. I have an old external DVD drive that connects by USB (not made by apple) and my old windows 7 CD. Am I able to install windows 7 by plugging it in, running bootcamp in the utilities folder, and waiting? Googling has me worried as I keep seeing issues, but mostly related to windows 8/usb issues. If anyone can shed some light on if my set up should work (or not) that would be very much appreciated, thank you!