Hello, I'm trying to boot a Linux-based OS from an external optical drive.
Using the UEFI boot options menu, I've set the boot order so that the regular OS boot manager appears last, but I still cannot get the other OS to boot.
I have the external drive connected by a cord to the USB port on the notebook. Legacy boot is disabled, boot from CD/DVD is enabled, secure boot is enabled.
The external drive is working-- in fact, its light blinks when I restart the computer. The DVD works on my desktop too.
Here's what I've been doing: Restart the computer. Hit 'esc', then 'F9'. At this point it only gives me two options, but both are for the Windows OS. It doesn't even list "internal drive", "external drive", or "USB" at this point.
Agh. Please help. Thank you.