found on another forum - better info:
Originally Posted by Tachyon
I've got a question with booting from a USB drive. I'm using an AWARD Bios. In the Boot menu, I see several options for USB; such as USB-CDRom , USB-Zipdrive or something e.t.c
Which one do I choose to make it boot from a FLASH DRIVE ? I don't see anything that implicitly says USB-Flash Drive.
I've only messed with the Abit IP35-Pro, but in many BIOSes, the various "USB-x" entries can be used, but if you partitioned/formatted the USB flash drive like a hard drive, it might be bootable by choosing "Hard Disk" as the boot option and then picking the "Hard Disk Boot Priority" (or similarly-named item); on the IP35-Pro it's directly above the entries where you select the "USB-CDROM", etc, entries.
One annoying thing about that method is that you have to have the flash drive inserted when you set the BIOS, and if you boot with the drive removed later, it will forget the entry and put the USB device lowest in the Hard Disk priority next time you boot. Depending on your need, though, that might be not an issue.
Hope that helps,