Reply to post: Re: Only one valid command

Re: Only one valid command

"DOS wouldn't format the system drive which it had booted from "

Depends on the version of DOS. In some early versions, simply entering the command FORMAT with no drive letter designated will allow you to format the current drive, regardless of whether your booted from it or not.

If Windows is running off the boot drive, the FORMAT command will not allow you to format that drive, because it is in use.