Installing windows7 on an external usb hardrive...

I have a 640gb external usb harddrive running at 5400 rpm. I was thinking "Wouldn't it be cool if i could carry around my whole opurating system in my pocket and whenever i go to someones house, i can plug in my hardrive in there computer and boot from it?" Well, i tried installing it on the drive, but I got an error message saying "Win 7 cant be installed on a usb hardrive" Anyone know how to get around it?

I already know its going to be extremly slow, I just want to try it :(
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