Once you know there’s an extra HD Data volume that you don’t want, you can follow the quick fix steps to delete that specific disk.Some helpful hints for differentiating the disks are the name and size. If there are two Macintosh HD Data volumes, you can identify which one you want to keep.You’ll see the different volumes on your Mac and their names.If the reason above for seeing the pop-up doesn’t make sense to you, or you aren’t sure whether there’s an old user’s Macintosh HD Data volume on your Mac, I have a way for you to check: I’ve put together some steps to follow to solve the issue depending on different scenarios. If the quick fix of entering a password doesn’t work, isn’t possible, or isn’t the right solution for you because you’re concerned about data loss, then you need my complete guide. If they have issues with you gaining access to their personal items, you might be able to reach an agreement for them to enter it purely for the purposes of deleting the disk.Īlso Read: Troubleshooting macOS Updates: Ultimate Guide How to Fix ‘Enter a Password to Unlock the Disk Macintosh HD Data’ – A Complete Guide If they’re still around, you can get them to enter it, and your problems will be solved. The fact that it belonged to someone else is crucial, as it’s probably their password that would unlock the disk. It might also pop up if you create a new profile on a Mac belonging to someone else. However, the error message might pop up if you reset or update your Mac that’s running macOS Catalina or macOS Big Sur.

It’s a quick fix that will make this pop-up go away. If the Mac is yours and has only ever been yours, I recommend entering your password to gain access to the disk. How to Fix ‘Enter a Password to Unlock the Disk Macintosh HD Data’ – A Complete GuideĮnter a Password to Unlock the Disk Macintosh HD Data: Quickest Way.Enter a Password to Unlock the Disk Macintosh HD Data: Quickest Way.

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