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The disk “Macintosh HD — Data” can‘t be unlocked.

Hi, Yesterday I have update MacOS BIG SUR. After login I got this 'The disk “Macintosh HD — Data” can‘t be unlocked.' A problem was detected with the disk, which prevents it from being unlocked.

popup message. How to resolve this issue?.


Thank,

Shan

Posted on Nov 13, 2020 1:18 PM

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Question marked as Top-ranking reply

Posted on Nov 15, 2020 12:30 AM

Had the same issue. In my case the Disk Utility was showing two "Data" volumes of the same size after upgrade.

One of the volumes was marked as Mac OS 11 volume but another one had no version indication so I just deleted it and the problem has gone.

5 replies

Nov 13, 2020 1:24 PM in response to shanshankar

shanshankar wrote:

Hi, Yesterday I have update MacOS BIG SUR. After login I got this 'The disk “Macintosh HD — Data” can‘t be unlocked.' A problem was detected with the disk, which prevents it from being unlocked.
popup message. How to resolve this issue?.

Thank,
Shan



Boot into Interent Recovery (Option Command R) and from the dropdown menu: Utilities>  Disk Utility> run the First Aid on your Macintosh HD (and the "Macintosh HD-Data" volume as well if Catalina/Big Sur) If errors are found and repaired, run again until no errors reported.


Disk Utility>View>Show All Devices The best sequence is —

  • Volume level
  • Container level
  • Parent drive


ref: Recovery: https://support.apple.com/en-us/HT204904





How to erase a disk for Mac - https://support.apple.com/en-us/HT208496

How to reinstall macOS from macOS Recovery - https://support.apple.com/en-us/HT204904

Nov 28, 2020 4:50 AM in response to shanshankar

Hi, I was updating my macbook to BIG SUR and faced with this. I was looking in many websites where users recommended to remove this partition, but in my case data on this partition was important and I've found the solution.

I did this: opened terminal and using diskutil found and UNLOCKED my partition. Just use "diskutil apfs unlockVolume /dev/disk..." command and enter passphrase after. I hope it will help you and others with same issue

The disk “Macintosh HD — Data” can‘t be unlocked.

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