Some users of macore Monterey encounter an unusual “Volume Hash Mismatch” error message, informing them that a hashing mismatch has been detected and reinstalling macOS on that volume. The full error message reads:
“Volume scatter mismatch – a hash mismatch was detected on a volume disk1s5. macOS should be reinstalled on this volume. ”
Some users experience this error after a major system crash or kernel panic, after which the error keeps recurring.
For some users, the “Volume Hash Mismatch” error is accompanied by a significant increase in instability on the Mac using macOS Monterey, with applications often crashing afterwards. Other users have an error message that is constantly displayed, but without any visible impact on Mac stability.
Troubleshoot “Hash Volume Mismatch” on MacOS Monterey
If you get this error message, it’s a good idea to back up all your data on your Mac right away using Time Machine or your backup mode, in case something goes wrong or your Mac becomes unusable for any reason.
After backing up your Mac, reinstalling macOS on an Apple Silicon Mac or reinstalling macOS on Intel Macs is a good idea.
Interestingly, some users still encounter the problem after reinstalling macOS Monterey on the computer, suggesting that additional troubleshooting or a solution from Apple in the form of a future update to macOS Monterey software may be required.
Another possible resolution is to restore from macOS Monterey to macOS Big Sur using a Time Machine or disk image, but this is not necessarily a feasible solution for most users.
What causes a “Hash volume mismatch” error?
It is not entirely clear what is causing the hash mismatch error, as users have reported it appearing randomly, or after a significant system crash or kernel panic.
For example, I encountered an error on an Intel Retina MacBook Air while installing software through a cask in the terminal and trying to enable high contrast mode on a Mac via accessibility. Suddenly all the apps crashed immediately, the Finder entered a crash circle, and the computer required a manual forced restart by holding down the power button. An error message appeared after restarting.
Other online examples include a message that appears seemingly random and returns after a restart.
For some other users, an error message appears if they run macOS Monterey on an officially unsupported Mac.
Volume Hash Mismatch error does not appear to be related to memory leak or other known macOS Monterey problems. There are some suggestions that there could be a problem specific to Monterey and certain SSDs.
This bug started appearing for some users during the Monterey beta test on Apple developer forums, but now with the final version being introduced to the general public, more general users have this problem and reports are starting to appear on regular Apple support forums.
Did you see the “Volume Hash Mismatch” error message on your Mac? Did you find that reinstalling macOS solved the problem? Did you find another solution? Share your experiences and thoughts in the comments.
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