however to mock-up windows 7 os from copy shielded dvd to usb flash drive?

its possible to install the porta on to the usb pen drive
but not by copying it
you can use the free version here to created a usb bootable version of the windows 7 disk

SARDU is a free* software that can build one multiboot support CD, DVD or a USB http://www.sarducd.it/

i use it a batch these years and on systems that dont have dvd drives too