I have this 8 gb toshiba flash drive and my motherboard also allows booting from removable devices. But I don't know, I've already tried to make the flash drive bootable and set in the bios to boot from USB. But it doesn't work. Are flash drives always bootable?
Well, I can't give you any technical explanation, but I do know that I have a couple of flash drives that are bootable and working, and others that don't (using the same techniques). So I guess the answer is:
No, they aren't always bootable.
Not sure if there is any way of knowing if a flash drive is bootable other than trying it though.
You need to make the flash drive bootable. Google bootable flash drive.
Also don't call the Flash drive "FD" people will confuse that with Floppy Drive...