How to create new VM in XenServer by using a NTFS usb flash drive?

view story

http://serverfault.com – I realize I can burn a DVD of the ISO for any OS (ubuntu, server 2012 etc) to install a new VM but this seems like a waste. I just installed XenServer 6.1 and would rather just copy the .iso onto a flash drive on my windows laptop, plug it into XenServer (I can see it in XenCenter under removable storage) and install from there instead of burning a few DVDs. So if I have a flash drive that I loaded an .iso from Windows (or the exploded, whatever is needed) does anyone have the steps to install a new VM from that drive? (HowTos)