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A few weeks ago I told all of my three external hard drives to encrypt. This went well, macOS (10.13.4) converted them to a APFS formatted encrypted volume, except for one drive. This drive doesn't complete it's encryption as it seems. Right-clicking on it shows a greyed-out entry for the "encrypt volume" command. I tried decrypting it using the cli by executing

diskutil apfs decryptVolume /dev/disk11s1

Which is answered with an error

Starting background decryption of disk11s1 using the "Disk" crypto user as authorization
Error starting background decryption of APFS Volume: The given APFS Volume is already encrypting or decrypting (-69573)

It seems as if the encryption got stuck somehow.

Is there a way to cancel or restart that process? Or do I have to copy all data from that volume to another and re-format the drive? I know that even Apple doesn't recommend APFS for hard discs, only for SSDs. Maybe that's the best way to go, right? I could reformat the drive with an encrypted HFS+ file system.

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