I did not get a GPT disk to work with the USB stick. Type convert mbr to create a Master Boot Record (MBR) partiton table. WARNING The following step will wipe all data from the USB hard drive: Type select disk X, then type list disk and confirm an asterisk next to the proper disk.
Note the disk number associated with your USB hard drive.
You can also use a Windows installation disc.
Windows ISO (I'm using Windows 10, but should also work with 7, 8, or 8.1).Seagate 750GB SSD/HDD Hybrid in a USB enclosure.128GB SanDisk UltraFit USB 3.0 (ultimate destination for Boot Camp).