11. In the elevated command prompt, type format fs=ntfs and press Enter. (See screenshot below)
NOTE: This may take a few moments to finish formatting the USB key.
You can also do
format fs=ntfs quick
if you want it to format it in a matter of seconds...
Also for some reason i can't boot from a ntfs usb drive, if you have this problem then type
format fs=fat32 quick
or no "quick" if you don't mind waiting for a couple of mins...