The modern solution for quickly and securely erasing your data is encryption. Modern devices have wear-leveling, block-sparing, and possibly-persistent cache hardware, which cannot be completely erased by these commands. This kind of secure erase is no longer considered safe. To perform the secure erase which it describes, you have to use the diskutil command in Terminal instead, using a command of the form diskutil secureErase freespace 2 /Volumes/volumeNameīefore using diskutil secureErase, you should read man diskutil, where Apple cautions: Although at present there appear to be no macOS utilities which can reconstruct such a removed volume, that situation will change in the future. This will destroy all APFS data about the original volume, but the file data for that volume will remain on the SSD.
In Mojave, all three secure erase options offer is that the original APFS volume is completely deleted, with any Preboot and Recovery directories, and it is then added back as a new volume.
Indeed, in Sierra they aren’t even available, which is perhaps a little more honest. It pretends to offer the same three secure erase options, but in fact none of them does what the dialog says. The snag is that Disk Utility won’t overwrite an SSD’s free space in the way that it does with hard disks.
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