Works, but dangerous
"Cipher.exe is a command-line tool. Microsoft has developed an improved version of the Cipher.exe tool that provides the ability to permanently overwrite (or "wipe") all of the deleted data on a hard disk.
This feature improves security by ensuring that even an attacker who gained complete physical control of a Windows computer would be unable to recover previously-deleted data."
Cipher.exe Security Tool
Permanently delete data from your hard drive
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