How to Secure Wipe a SATA Hard Drive using a MacBook Pro
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In this tutorial you’ll learn how to securely wipe all the data from a SATA hard drive so that it can’t be retrieved using forensic software.
You’ll definitely want to do this when selling or throwing out an old hard drive containing sensitive data.
I’ll show you how to securely wipe (also known as format) the SATA drive on a MacBook Pro (2017, Two Thunderbolt 3 ports) running macOS Mojave. However, the steps below might work on different Apple hardware with different versions of macOS.
Step 1: Connect the SATA Hard Drive
Step 2: Open Disk Utility
Search for Disk Utility in spotlight and then open it. You should see a screen that shows your Mac internal hard drive and the external hard drive you connected in step 1. As you can see below, the name of mine is WD:
Step 3: Select Drive to Erase
Right click on the external drive and then click Erase…
Step 4: Name, Select Format and Security Options
Give the drive a name and select the format. Choose MsDOS or ExFAT if you want the drive to work on Windows, Linux and Mac. I’ve chosen ExFAT because it allows you to store individual files greater than 4 GB in size. Click Security Options…
Select option 3 or 4 by dragging the slider to the right. Option 4 is the most secure but it takes a long time. Option 3 should be secure enough. Select option 3 then click OK and then Erase.
You should now see the Erasing disk progress bar. Wait awhile for Disk Utility to do its magic and then you should have a blank disk that even forensic software will not be able to restore data from.