What is “scrub” Package?

Writes patterns on magnetic media to thwart data recovery
For more details: https://code.google.com/archive/p/diskscrub/

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install scrub.

  brew install scrub

Now, use scrub!