Friday, September 29, 2017 [Tweets] [Favorites]

Finder’s Unwanted Conversions to APFS

Mike Bombich:

Take any HFS+ formatted volume that does not have an installation of macOS on it (that part is key), right-click on the volume in the Finder and choose the option to encrypt it. Rather than simply converting the volume to a CoreStorage Encrypted volume and keeping the HFS+ format, macOS converts the volume to APFS with no warning, and then enables encryption.

[…]

APFS Encrypted volumes aren’t backwards compatible at all, so if you attach that converted disk to a Mac running an older version of the OS, you’re greeted with this heart-attack-inducing error message[…]

[…]

But if I disable encryption on my APFS volume, the APFS part sticks – it’s not possible to convert an APFS volume back to HFS+ without erasing it.

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