zero out harddrive without getting rid of ubuntu?
So I recently downloaded ubuntu onto my machine. Upon installation, it never prompted me if I wanted to partition it, it just went ahead and installed on my C drive which is also my windows 7 drive. My plan was to zero out my C drive (more specificially my windows 7 drive) and leave ubuntu running as my primary operating system.
Does anybody know how I can go about zeroing out my harddrive without also getting rid of ubuntu? Any help would be great. Thanks!