![]() When I use Disk Utility's Erase button on an SSD, the Mac clears out that key, so even though the data hasn't been overwritten, it's all inaccessible ciphertext now that the key is gone, and is as good as zeroed-out. These options are not needed for an SSD drive because a standard erase makes it difficult to recover data from an SSD. I'm a couple years late to the party, but it might be worth pointing out that Apple (who has now entirely remove 'Secure Erase' options from the Disk Utility app) hasn't really removed the option because it 'isn't necessary' according to its, they did it because they can't guarantee a secure erase: Description: An issue existed in guaranteeing secure deletion of Trash files on some systems, such as those with flash storage.
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