Boot Camp makes unbootable USB drive I used Boot Camp Assistant to create a Windows 10 install disk. However, the disk is not bootable. I am confused as to why Boot Camp Assistant would make an install disk not bootable. Can someone please help me? I am looking for someone to either a) explain how to recreate the install drive in a way that will make it bootable or b) explain how to force the drive to become bootable.

Here is the information:
Your Mac Pro (MacPro4,1) officially neither supports Windows 10  nor booting from USB thumb drives.

The only Mac Pro model supporting Windows 10 installed with Boot Camp Assistant according to Apple is the Mac Pro (Late 2013).