reformatting a disk for windows98

[Linda Hanigan]

I have an unused computer setting around that has unbuntu installed on
the hard drive. I replaced it with a newer and faster computer. My son
really wants to play his sisters old win98 games. Since I still have a
Win 98 CD for the computer I thought about reinstalling win 98 on it for
him. Does anybody know what I have to do to reformat the drive as a
vfat?
 I assume boot from cd and run
mkfs.vat /dev/hda
                    Linda