RE: " . . . which implies that secure erase is available in Disk Utility with a HDD."
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As best as I can tell, SECURE ERASE still exists in DISK UTILITY . . . but only for external thumb and hard drives.
The "erase" tab is greyed-out in DU in regard to the internal HDD.
Careful! Are you looking at the erase tab as respects the drive/volume into which you're booted? That will always be greyed out.
Interesting that secure erase exists for thumb drives; shouldn't they be subject to the same limitations as SSDs?
I just booted into my recovery partition, and secure erase wasn't an option, either because I'm running an SSD or because I've failed to see through the murky Apple docs to which I linked.
