How to Remove Linux from Boot?

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Could anyone answer a question on how to remove Linux / LILO from 
the boot sector of a hard drive?

I am trying to re-install DOS on a small hard drive that has Red 
Hat 4.X on the boot sector.  I have tried a DOS FDISK to delete 
all partitions, a DOS format, and a Red Hat setup / delete 
partition to delete Linux...and it still boots Linux! Help!


Many thanks in advance!  

Brian H. 
brian_harper na compuserve.com