adding new drivers to usb bootable windows 7 iso

dism /mount-wim /wimfile:boot.wim /index:2 /mountdir:mount
dism /image:mount /add-driver:"usb3" /recurse
dism /unmount-wim /mountdir:mount /commit



dism /Get-WimInfo /WimFile:install.wim


##### install windows 7 ultimate

dism /mount-wim /wimfile:install.wim /index:4 /mountdir:mount
dism /image:mount /add-driver:"usb3" /recurse
dism /unmount-wim /mountdir:mount /commit

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http://codeabitwiser.com/2014/03/how-to-install-windows-7-with-only-usb-3-0-ports/