How to format a USB memory key. If you do not have a floppy disk drive, you may want to create a bootable USB memory key which will allow you to boot into a pure DOS environment.
This can be very useful if you want to flash your BIOS. Here is a step by step procedure on how to perform this operation. NOTE: Your computer must support booting from a USB device in order to boot from the USB Memory Key. Step 1 - Download and install the Windows based HP USB Disk Format Tool. For your convenience, you can download it from HERE. DOS Bootable USB flash drive - how I did it : Perley's Pontificating Place. There are 2 things you need in order to make an USB flash drive boot into DOS.
The first is a boot sector, and the second are the DOS boot files. Below are the steps I used to get these onto a USB flash drive, making it possible to boot into DOS from the USB flash drive. The following steps where all done in Microsoft Windows XP in a VMware virtual machine. They should work with most other versions of MS Windows. The FreeDOS Project.