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The clean all command is the most secure built-in way to wipe a drive because it writes zeros to every sector. You run this on your C: drive while Windows is running; you must boot from a Windows 7 installation DVD or recovery USB.
Save important files to an external drive or cloud storage like Dropbox or Google Drive. how to wipe hard drive windows 7
Click , type cmd , right-click it, and select Run as Administrator . Type diskpart and press Enter . The clean all command is the most secure