The disk in question is disk04 - a 128 GB SSD drive in an external USB enclosure. I booted the Macbook from a X.11 USB install drive and there was an internal SSD drive as well. a simple fdisk ...

Formatting your hard drive is an important step in setting up your computer. It clears all the data off the disk so that you can start fresh. DiskPart is a powerful command-line tool that allows you ...

The Windows tool Diskpart overwrites all data on the hard drive with a zero, which is considered a secure deletion method. This applies at least to classic hard drives, i.e. HDDs with magnetic discs.