Previously to finding EZBoot, I used to used Bart's method for creating bootable CDs.
One thing I find myself frequently doing is updating motherboard BIOS. The way I would always do this before is just copy the BIOS utilities to a floppy and not waste my time making a boot disk.
I would then boot from my CD (which boots from a win98 boot floppy image), and update the BIOS by referencing the floppy disk with drive B (drive A is the bootable CD).
Since I've switched to EZBoot I can no longer access the floppy disk at all. Drive B and Drive A both point back to the bootable CD Image.
Please note.... I just today updated to version 5. So if that was fixed in version 5, I apologize for the early post. I will be trying it later today and update the post with results.