As mentioned earlier, Disk Utility 18.0 in macOS 10.14.2 Mojave doesn’t do what it claims when you select Security Options for formatting SSDs. This article explains exactly what it does, how to perform what it doesn’t, and details another separate bug and its workaround.
Security Options
When you erase or format a disk in Disk Utility, there is a button offering Security Options for secure erase. These appear to work as claimed on conventional rotating hard disks, but work quite differently on SSDs.
The first option (control at the far left) is the default, and doesn’t attempt any form of secure erase.
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