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Since upgrading my Mac to BigSur on start up I get the error message The Disk "Macintosh HD_Data" Can't be unlocked. I accept it and all seems to work OK. How can I stop this happening

Since upgrading my Mac to BigSur on start up I get the error message The Disk "Macintosh HD_Data" Can't be unlocked. I accept it and all seems to work OK. How can I stop this happening

MacBook Pro 15″, macOS 11.1

Posted on Jan 18, 2021 5:21 AM

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7 replies

Jan 18, 2021 6:14 AM in response to Bry369

Bry369 wrote:

Since upgrading my Mac to BigSur on start up I get the error message The Disk "Macintosh HD_Data" Can't be unlocked. I accept it and all seems to work OK. How can I stop this happening


if you have Two Macintosh HD - Data


from Disk Utility.app you can see the mount point


One will be mounted at /System/Volumes/Data this is the one you want to keep,

The other will be mounted at /Volumes and you can simply use the “ -“ to delete it.


ref: About the read-only system volume in macOS Catalina - Apple ...

https://support.apple.com/en-us/HT210650



here is an example of a properly formatted drive:


Since upgrading my Mac to BigSur on start up I get the error message The Disk "Macintosh HD_Data" Can't be unlocked. I accept it and all seems to work OK. How can I stop this happening

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