Windows 10 Install on a Firewire Drive

[BoxsterRS]

Hello,

I created a USB with the Windows Tool of Windows 10 so that I can install it on an external Firewire drive. When I open bootcamp I click on next and get a message to download the windows 7 drivers only. The other option is grayed out. I then get a message about space that I need 50gb of space. I would appreciate some help I want to run Windows 10 from my external firewire drive and don't know what else to do. I am trying to do this on a 15" MacBook Pro 2.0ghz i7 early 2011

 

[chrfr]

Windows isn't going to be able to boot from the firewire disk, which is one reason the Bootcamp Assistant isn't offering to let you do this.