The old school way to do it back with win98 from dos was typing - format c:

No idea if that will work with win2k or winxp though. I thought I had gotten some type of message saying that the disk can't be formatted because it was active or something. You might be able to do it by creating a book disk if that happens. You can also reformat using the install cd when doing the installation. Since you are reformatting it, I'm guessing you have a cd to reinstall windows or some other os?

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