Eraser is an advanced security tool for Windows which allows you to completely remove sensitive data from your hard drive by overwriting it several times with carefully selected pattern

Cipher.exe is a command-line tool, Microsoft designed the utility to encrypt and decrypt data from drives using the NTFS file system. However, you can also use it to overwrite deleted data to prevent recovery.

Cipher will overwrite the deleted data, making it very difficult for anyone to use recovery software to reconstruct and restore the files and folders from the hard drive.