create usb install windows 8 uefi

To Manually Create a Bootable UEFI USB Flash Drive

1. Connect the USB flash drive.

2. Open an elevated command prompt in Windows 7 or Windows 8/8.1.

3. In the elevated command prompt, type the commands below one at a time and press Enter after each one. (see screenshot below step 5)

• diskpart
• list disk

4. Make note of the Disk # (ex: Disk 4) for the USB flash drive. (see screenshot below step 5)

   Warning

It is critical that you use the correct disk #. If you do not, then you could delete the wrong drive below and lose everything on it.

5. In the elevated command prompt, type the commands below one at a time and press Enter after each one. (see screenshot below)
NOTE: Substitute # in the first command with the actual disk # from step 4 above. For example:select disk 4

• select disk #
• clean
• create partition primary
• format fs=fat32 quick
• active
• assign
• list volume
• exit

6 copy all windows 8 DVD to usb .

source:http://www.eightforums.com/tutorials/15458-uefi-bootable-usb-flash-drive-create-windows.html