Bootable USB Drive with cmd

1. Insert a USB flash drive into a running computer.
2. Open a Command Prompt window as an administrator.
3. Type diskpart.
4. Type list disk
5. Type select disk # , where # is the drive number or drive letter of the USB flash drive
6. Type clean
7. Type list partition
8. Type create partition primary
9. Type select part 1
10. Type format fs=ntfs quick
11. Type active
12. Type exit
13. When you finish preparing your custom image, save it to the root of the USB flash drive