Hello, I have USB flash 16GB. I want make 2 partition 8gb each and make Mac OS 10.11.4 boot flash on first partition and make Windows 10 on second partition. I make first partition for Mac OS JHFS+ and successfully boot USB flash. Second partition for Windows I make MS-FAT, but Boot Camp want write Windows on all flash, not second partition. How write Windows boot usb flash on second partition?