You Need to Do More Than Delete Files on an External Drive to Make Them Permanently Disappear

There’s a trick to thoroughly wiping all your data before you junk your old external solid state drive—or even computer.
Macworld

A drive and a partition: How to understand the difference when erasing Mac disks

Carmela writes in with a question after wiping a 2010 MacBook Pro and reinstalling macOS: I wanted to restore it to factory settings, but while erasing the disk I erased not only “Macintosh HD” but ...