Xorcrash

Secure deletion suing Peter Gutmann method. This tool will overwrites file contents before deleting with 35 passes (patterns), 8 of them are Pseudo-Random. It can be highly effective for preventing recovery of deleted files.

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Maabi Anti-Forensics File Deletion Tool
Free
Overwrite file contents with Gutmann Algorithm before deleting to prevent recovery of deleted files.
Windows

Xorcrash

Maabi Anti-Forensics File Deletion Tool