USB boot on a Toshiba notebook

[DB]

Evening All,

I have a Toshiba Equium A60-692 and would like to try F10 without 
destroying Mr Gates's "image" on the HD.  I've run the Live CD - very 
impressive - but would like to try say setting up an F10 on an external 
USB-HD or a modifiable USB stick.  Sad thing is... Toshiba-san decided 
that his bios will only accept HD, CD, or USB-FDD as boot 
possibilities.  Does anyone have an idea how I can fiddle the stick or 
external HD to make it look like a USB-FDD????

Thanks for any ideas!

Dave