Hi, I have MBPr 2014 15" and trying to run Windows 8.1 on external SSD. I followed this guide.http://bleeptobleep.blogspot.com/2013/02/mac-install-windows-7-or-8-on-external.html Installation is completed, but when I boot the windows, it keeps loading forever. While I was installing, I made 2 mistakes. 1) I made the installation usb flash by using 8.1 Pro, but I had to get "install.wim" from 8.1 Enterprise demo. I had to format entire flash drive on MBPr to make a partition to install 8.1Pro, then I forgot to move ISO to External HDD, so it's gone. I have a disk, but my CD drive is broken that time, so I decided to download a demo to pick install.wim. 2) After the installation was done, and opened the disk image into the external SSD, I erased the partition on MBPr's flash storage. Some other sites say I had to keep the partition somehow. Do you think these are causing the problem, or am I missing something? Thank you, and sorry about my terrible English.