[ubuntu] Install Windows 7 From External Hard Drive

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http://ubuntuforums.org – Hi guys, So I was looking into how to install Windows 7 from an external USB hard drive. I found a few different programs that allow you to do this by extracting the Windows 7 image file to the external hard drive in such a way that when you boot the computer up, it will boot from the external hard drive and bring you to the Windows 7 installation process. The only problem is they were Windows-only programs it seemed. I'm using Ubuntu 12.04 and was wondering how I could go about prepping my external hard drive the same way, but using an Ubuntu-friendly program. Any help would be greatly (Hardware)