windows 7 on external hard drive using boot camp

[salain]

Hi,

I' wondering if it is possible to install windows 7 on an external hard drive with boot camp. I want to be able to boot on windows only when I have my external hard drive connected so i would have to separated hard drive for both system.
Thanks

 

[DockMac]

AFAIK, it's impossible to boot of an external into Win 7. It has to be internal.