Select the old data volume and click the (-) button above "Volume".The (-) button above "Volume" will NOT be greyed out. If you selected the old data volume, the Mount Point will be different than above.Also, the (-) button above "Volume" will be greyed out for safety. If you selected the real legitimate Data volume, the Mount Point will be "/System/Volumes/Data".Select one of them, then check the Mount Point: You'll see two entries named "Macintosh HD - Data".It's located in Applications -> Utilities. You'll need to identify the old data volume in Disk Utility and delete it. Doing that automatically deletes all volumes in the container, then makes a fresh new one.īut anyways, on to the solution for your issue. This erases and deletes the linked data volume, and then erases the system volume so that you can reinstall macOS.Īlternatively, to ensure that all macOS volumes get erased, you could select View -> Show All Devices in Disk Utility, and then erase the APFS Container. If you want to erase your Mac in Disk Utility, the correct procedure is to select either "Macintosh HD" or "Macintosh HD - Data", click Erase, then select Erase Volume Group. The old data volume was left behind, and that's why you're now seeing the prompt to unlock the old data volume.
When you ran the macOS installer on the freshly erased "Macintosh HD", it linked that volume with a new data volume and installed macOS. I'm guessing that you erased "Macintosh HD", but left "Macintosh HD - Data" alone, which contained the previous owner's data. However, if you only erase one volume, the other one remains untouched and becomes unlinked from the volume that you just erased. When you erase your Mac, both volumes will appear in Disk Utility. These two volumes are linked together in a volume group. MacOS Catalina and macOS Big Sur (you're running Big Sur) use two volumes to store data: the System volume (Macintosh HD, contains macOS), and the Data volume (Macintosh HD - Data, contains your apps and data). It appears that you improperly erased your Mac.
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