Techgage posted a look at creating a bootable thumb drive equipped with DOS, easily.

Creating a bootable flash drive equipped with a Windows installer or Linux distro is a simple affair today, but what about creating one with DOS? Yes, DOS. The need for such a thing can hit you when you least expect it, especially as a hardware enthusiast, but luckily, creating one is very, very easy.

  Creating a Bootable DOS Flash Drive the Easy Way