you'll need a dos floppy to do that. you can't do it in windows xp
format c: /s /q
/s copies the system files to make it bootable.
/q quick format
edit: forgot to ask.... why do you even want to do this? if you want to mess around in dos, try either dosbox or install pure dos in vmware or something.....
or if you need to flash/backup your bios, just get a bootable iso (ultimatebootcd is one) that drops to a command prompt and have a small fat32 partition that you can easily read/write from.
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