Volume Hash Mismatch Detected macOS Should Be Reinstalled

Volume Hash Mismatch

Hash mismatch detected on

volume disk1s5.

macOS should be reinstalled on

this volume.


I have gotten this message a couple of times. The most recent time I was on the web creating a listing on eBay.


I am not sure how I go about re-installing the OS on my iMac?


Here is a screen shot of the message.


Thanks for the help!

iMac 27″

Posted on Oct 26, 2023 11:59 AM

Reply
19 replies

Nov 4, 2023 10:41 AM in response to MrHoffman

Thanks. I had to buy a new external drive to run Time Machine which now has mutiple backups of my computer on it.


So the next step is re-inistalling the OS.


When I follow the link you shared I am not sure about one thing. If I choose to install the latest version of the OS how do I get my current desktop, apps, etc. that are on Time Capsule inserted into the new OS ?


Thank you!



Nov 4, 2023 11:02 AM in response to G4RAY

If the re-install ends up becoming an erase-and-re-install, the following (highlighted) section is where the Time Machine backups get migrated / restored / reloaded, as part of the first startup of the new macOS install.


Setup Assistant loads your content from the backup.






Note: If you decide to skip the first setup and skip running the setup assistant (setup assistant is effectively the same as migration assistant, run during the first startup, and which also migrates previously-installed apps), then pick your first newly-created login at first startup different than the login name you want to restore. If you have a login called MyName that you really want to use, do not create a new MyName at that first login after an erase-and-install, as now you won’t be as easily able to migrate your previous backup of MyName. Pick MyAdminName or other such name as that first new user after the erase-and-install, and use that, and then you can migrate in your MyName files later using Migration Assistant.

Nov 4, 2023 11:17 AM in response to MrHoffman

Thanks!


And I am a little confused about what you said at the bottom about log-in names.


What is the easiest way to install a current iOS, preserving my files and settings, without re-installing my current iOS?


Sorry if I seem a little slow. I don't want to screw this up and create more problems for myself.


Thanks!

Nov 4, 2023 6:37 PM in response to G4RAY

FYI, most likely this issue is caused by a hardware failure, most likely bad memory. There have been numerous posts on this forum and several people have confirmed Apple replaced the Logic Board for a memory failure. If it is due to a hardware failure, then it is likely you will see this problem recur after some time even after a clean install of macOS.


You may want to try running the Apple Diagnostics to see if any hardware issues are detected. Unfortunately the diagnostics rarely detect any issues even when there is a hardware failure, but it never hurts to check just in case it reveals an issue. It may save you a lot of work.

Nov 5, 2023 1:16 AM in response to G4RAY

To add to a posting related to a possible Bad RAM Module


In most of the situation in links below.


The RAM Module has failed or is failing


The only true way to determine this, is to have the machine Evaluated in an Over Night Stress Test by Apple Store or Apple Authorized Service Centre


Volume hash mismatch, cannot reinstall MacOS


Monterey rev 12.4 - Hash mismatch


Please help - Terminal.app keeps crashing upon reopening - macoS Monterey version 12.4


Volume Hash mismatch


Strange Disk Space Issue


RAM Failure 

Volume Hash Mismatch Detected macOS Should Be Reinstalled

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