Here is a little com file I designed to replace the FORMAT command. It is 
used to prevent accidental or purpose formatting of a fixed disk.
It will allow you to format A: or B: drives whenever, but as soon as you try 
to format C: a message will appear saying " You can NOT format a fixed disk!"
You must type format@ C: to really format C:.
 
    To begin...
       
         1) Change to the DOS directory.
         2) Rename FORMAT.COM to FORMAT@.COM this is done by 
            typing.
                
                REN FORMAT.COM FORMAT@.COM <ENTER>
         
         3) Now hide the old FORMAT.COM by typing

                ATTRIB FORMAT@.COM +H

         4) Last step, copy the new FORMAT.COM to your DOS directory.

               COPY FORMAT.COM C:\DOS/V

 That's it. Happy computing. If you have any questions or suggestions, message 
 me on this board. Check with me for any new programs I may be working on.

 -Edward Gee
  Quincy College Byte Exchange
  Quincy, MA

 PS. If you have some sort of Anti-Virus (and you should) program press 
     [U]pdate or the equivalent to accept the new program.