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I had a damaged disk that's encrypted with CoreStorage / FileVault. DiskWarrior was unable to operate on it while encrypted, obviously (“This is an offline, unavailable Core Storage disk.”); but the diskutil corestorage unlockVolume [UUID] operation both unlocks and mounts the volume.

With a damaged disk like this, I'd really like to avoid mounting the filesystem before working on it — I'd just like to unlock it so I can proceed with recovery tools.

Is there any way to enter the disk's password without causing it to subsequently be mounted by OS X?

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2 Answers 2

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diskutil corestorage unlockVolume has a -nomount option that you can use to achieve this exact effect.

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Click the Unlock button in the top-right of DiskWarrior and enter the password to unlock the volume

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    Welcome to Ask Different. We prefer answers be more than just 1 sentence, see How to Answer for tips. Also, how does this answer apply to what the OP stated about not wanting to enter the disk's password?
    – fsb
    Commented May 2, 2018 at 18:53
  • That worked for me. Unbelievable how its not clearer that you need to do that, but I didn't realize that the unlock was related to this problem until I saw Greg's answer
    – Robert J Berger
    Commented May 30, 2018 at 2:17

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