[gentoo-user] Booting an exernal usb drive from grub

[Michael Sullivan]

My server box died last week, and, as it was about ten years old, I
decided to replace it.  My wife and I opened the case and removed the
hard drive (A major undertaking for us, I might add).  We hooked the old
hard drive up to a hard drive enclosure and plugged it via USB into a
new computer we bought this morning.  This new computer runs Windows
Vista and only Windows Vista.  I want to run Gentoo Linux on the
enclosure.  I have to keep Windows on it because all the computer repair
shoppes around here only know Windows, and will be confused if I take it
in to be repaired and it isn't running Windows.  I planned to install
grub on the main internal hard drive and use that to boot to the USB
drive.  I checked the BIOS, and there's no option to boot to USB.  I've
spent a couple of hours today googling this question, but all I can seem
to find is how to do this from a linux partition other than the one on
the USB drive.  Is this even possible, and if so, how would I do it?
-Michael Sullivan-