We will need to know the make and model of the motherboard, and
possibly the bios revision to answer that question precisely. I've
seen a number of motherboards where boot from usb option was added as
after a bios upgrade.
To answer another question. "Is it possible to boot WINDOWS from an
external usb hard drive?", the answer is NO.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.