1. Open the command prompt in Win7 (CMD with admin right).

2. Type: diskpart

3. Type: list disk

4. Find the disk number of USB drive. (i.e. disk 2)

5. Type: select disk 2

6. Type: list disk                

    A star(*) should shows at front of disk indicate it's selected drive

7. Type clean

8. Type create partition primary (or just type cre part pri)

9. Type active

10. Type format fs=fat32 quick

11. Type exit

12. Mount ISO file to virtual drive or burn to DVD

13. (i.e. F: is DVD drive, G: is USB drive)

      Type xcopy F:*.* /s/e/f G:

Done. If format USB drive in Win 7, might need to type following command to make it bootable. (this method not been tested)

F:\boot\bootsect /nt60 G: