Monday, July 05, 2021

Disk Utility First Aid problem in Mojave: Working around the Disk Locked bug

If you've used Disk Utility in Mojave APFS you know it's become much more complex than HPFS days. Recently I tried running it from the Recovery start and got a Disk Locked error that said I needed to wipe the drive and reformat. I couldn't find any fix for this on Google.

This did fix it:

1. I rebooted into macOS and ran Disk Utility from there.

2. I rebooted back into the Recovery mode and this time the disk was not locked.

I don't know what did the trick. Maybe all I had to do was go back into normal boot and then back to Disk Utility, but I think I tried that and it wasn't sufficient. I had to run Disk Utility from macOS.

I suspect a safe boot might have worked too. Anyway, the point is, if you're stuck and you find this post it's fixable.

PS. This isn't about mounting an encrypted disk.

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