This document provides instructions for creating a bootable DOS USB drive using the RUFUS software. It explains that creating a DOS bootable USB is useful for situations where you need to boot a computer using DOS, such as when troubleshooting BIOS problems or using low-level utilities. The steps include downloading RUFUS, selecting a USB drive of at least 4GB in the software, choosing FreeDOS as the boot option, and clicking start to format the USB and make it bootable. Basic DOS commands are also recommended to learn to better use the bootable USB drive.

1. WELCOME TO
How To Create a Dos Bootable USB Pen drive

2.  Creating a dos bootable USB pen drive is an
easy task as MS-DOS isn't used that often still
there are some cases where we need to boot a
computer using a dos bootable USB.
 You might be having problem with BIOS or any
other firmware or want to use low-level utilities in
those circumstances it would be really helpful if you
create a one for yourself.

3.  Here in this slideshow, we will be creating a
bootable USB using a free program called as
RUFUS. It is a free tool but extremely powerful and
very easy to use.
 You may want to boot your computer or PC from
this USB in case need to Reset BIOS password as
there are many programs to crack CMOS password
used only with dos bootable disk.

4.  Before some years ago I used to boot my computer
using a bootable floppy but nowadays using floppy
disk has died no personal computer or even laptops
have a floppy disk installed in their cabinets.
 Therefore it made me think to create a USB FLASH
DRIVE for myself as USB is seen commonly in
about all the modern day computers.

5. CREATING A DOS BOOTABLE USB
 You must have a pen drive more than 4 GB of
capacity
 You will need a software with which we will be
creating USB pen drive . You can download the free
software from below given link
 check for working USB slots available on your PC
or laptops

6. RUFUS SOFTWARE
 Step 1 :: Double Click On
Rufus.exe file
 Step 2 :: Connect Your Pen
drive to one of the USB
slots available
 Step 3 :: Select Your Pen
drive In Device Option.
 Step 4 :: Select Free Dos.
 Step 5 :: Click On Start
 (Note:: All The Data In The
Pen drive Will be
Formatted) Kindly backup
all important data from your
pen drive as it will erase all
the data inside.

7.  Tip :: Now go to Bios setting and make necessary
change and boot your system using this pen drive
After creating Dos Bootable Pen drive Use can also
copy software in pen drive by simple copy paste
from windows

8.  Now after the USB bootable pen drive is created
you can also copy BIOS flashing files by using copy
paste using windows .Which can be used later to
flash BIOS.
 You can now use this USB thumb drive as you use
windows bootable device still if you want to master
DOS you should be aware of some basic dos
commands which will help you immensely and your
comfort level will increase with some small amount
of practice .

9. SOURCE::
• http://www.chtips.com/bootable-pendrives/how-to-
create-a-dos-bootable-usb-pendrive
• http://www.chtips.com/bootable-pendrives/how-to-
create-a-bootable-usb-pendrive
• http://www.chtips.com/msdos/basic-dos-commands