This isn't a new topic. Already there are many guides out there for creating bootable KNOPPIX on USB Flash card or memory stick. Here, I am looking at a different but also important problem: getting DOS (Dr. DOS / OpenDOS / FreeDOS, etc.) to boot on USB Flash memory.
This will be useful for flashing motherboard BIOS (or display card BIOS). Also many recent notebook models just don't bundle floppy drive anymore; Nor do I have any reason for owning floppy disks if I can have DOS bootable on USB memory card, and flash BIOS with it.
Here are the guides for creating bootable DOS on USB memory stick or Flash card.
1. Bootable USB Keys (solution for Linux and Windows)
2. Bootable USB memory stick (solution for Windows)