Your Mac, and any external drives you use, may contain important personal data. Your Mac’s drive is full of sensitive data: all your emails, contacts, private documents, and more. If you use an external drive for, say, your music and video libraries, then this isn’t the case, but if you use an external drive for backups, there there’s lots of sensitive data on it.
Whenever you dispose of a Mac, or an external drive, you should securely erase it to ensure that no one can harvest data from it.
In this article, I’ll explain how to securely erase all sorts of drives: hard drives, flash drives, and SSDs.
Read the rest of the article on The Mac Security Blog.