Is there a way to do this?

is there a way to install a windows OS on a drive that is connected via usb connector? I have the drive connected to my laptop and want to install the windows OS while running windows.
Answer #1
It is possible, I installed XP to my External.
I had to boot up and run the setup, as it wouldn’t work otherwise.
Answer #2
yes u can
Answer #3
here’s how to do it:
http://www.intowindows.com/install-windows-7-on-usb/