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Disk Utility/First Aid in Safe Mode shows error not shown when running in Recovery mode

I've had some problems with my computer restarting overnight. Etrecheck (see below) seemed to show some minor issues. I’ve run Disk Utility first aid in safe mode and all is ok until I get to running it on my Apple SSD. I am told "Problems were found with the partition map which might prevent booting" and "Couldn't mount disk :(-69842)". But I do not get this message when I do it normally or in recovery mode.... understandibly I'm worried! I've tried it several times. Running DriveDX doesn't say there are any problems.


Any ideas much appreciated.




MacBook Pro 16″, macOS 12.3

Posted on Apr 19, 2022 10:00 AM

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8 replies

Apr 20, 2022 9:48 AM in response to sandjensen11

Hello sandjensen11,


Based on what you described, it appears intermittent and may have been resolved when the Mac was put in safe mode then checked again.However, if you feel there still might be issues, back up your Mac then reformat it ensuring the correct partition is set to the internal disk:

  1. Back up your files with Time Machine on Mac
  2. Erase and reinstall macOS - Apple Support


If you still see the same thing, it might be related to hardware,. This link will help with service options: Mac Repair - Official Apple Support


Take care.


Apr 20, 2022 6:10 PM in response to sandjensen11

Unfortunately I've seen the same issue with Disk Utility on some of our organizations Macs. While booted into Recovery Mode and running First Aid, make sure to click "Show Details" and scroll back through the report to see if any unfixed errors are listed even if First Aid says everything is "Ok". Disk Utility today now lies to people saying everything is "Ok" even when errors are reported and I can confirm the file system is at fault with a system.


Unfortunately I've never seen First Aid to repair the partition issues for the error you mentioned. I've always had to erase the whole physical drive to resolve the issue.


In the crash logs listed in the EtreCheck report one of the entries mentions "/usr/libexec/lsd" which I found online is related to the macOS Launch Services Daemon. Maybe try booting into Safe Mode which disables third party startup items & drivers to see if this may help narrow down the problem.


The crash logs also list about a dozen "ProxiedDeviceBridge" error logs. I'm not sure what this may indicate.


Try disconnecting all external devices in case one of them is causing a problem.


If you have a spare external USB3 drive, you can try performing a clean install of macOS to the external drive and booting to the external drive to see if the same issue occurs. Test it first with the default install before installing any third party apps, or migrating/restoring from a backup. You will need to modify the Startup Security Utility settings while booted into Recovery Mode to allow booting from an external USB3 drive. This can narrow the problem down to software/OS issue or an issue with the internal SSD and/or file system.


Sometimes even reinstalling macOS over top of itself will fix some OS issues, but first make sure the file system is Ok.




Apr 21, 2022 8:17 AM in response to HWTech

Thank you so much HW Tech.


My computer hasn't rebooted for a few days now, and I'm wondering if I'm chasing something that isn't there i.e. is it actually a problem that I'm getting that error message in Safe Mode?


Right now I'm in the lengthy process of moving my time machine back ups (on a Seagate UltraTouch) to another external drive, as Seagate are going to send me a replacement (based on the DriveDx life-span pre fail command time out warning that there could be a problem with power supply or oxidized data cable). As soon as I'm done with the transfer I will do as you suggest, boot in recovery, run first aid and check the 'show details' option.


Regarding the "ProxiedDeviceBridge" error logs -

I found another thread here on these forums which you'd replied to - BridgeOS causing kernel panic in MacBook … - Apple Community

And, I also found the following in my /Library/Logs/DiagnosticReports/ProxiedDevice-Bridge/Retired - panic-full-2022-04-18-054811.0003.ips :



{"caused_by":"macos","macos_version":"Mac OS X 12.3.1 (21E258)","os_version":"Bridge OS 6.4 (19P4243)","macos_system_state":"running","incident_id":"F1A253E3-9AAC-4A6A-80A0-1B432F74C82C","timestamp":"2022-04-18 04:43:23.00 +0000","bug_type":"210"}



Urg!

Apr 20, 2022 10:16 AM in response to Nicholas_B2

Thanks Nicholas. I still get the same error message with Disk Utility when I boot via Safe Mode, but again, not in recovery mode/normal mode. I'm wary of going through the process you describe as it is as you know time consuming, but perhaps it's the best step. I did DriveX on my external drive, and it has a 'command time out' and tells me there may be some problems with power supply or an oxidized data cable. I did unmount the drive and try the above process, but sadly still got that error message..... anyway seems a good idea for me to replace that drive before reinstalling the OS!

Apr 20, 2022 10:53 AM in response to barberlives123

Thanks barberlives123 - I did as you suggested and it said there were no issues. I suppose I could call Apple to see if they have any ideas why I'm getting that error message with Disk Utility in Safe Mode (I'm still under warranty), and in the meantime get a new external hard drive for back ups given that is the only thing that has shown a potential problem via DriveDx...

Apr 24, 2022 3:06 AM in response to HWTech

So (after the 2 days it took me to find out you cannot transfer Time Machine backups that are on an APFS drive to another drive), I booted into Recovery Mode and ran First Aid again. It said everything is ok and "Show Details" did not report any unfixed errors. So I'm presuming the issue with doing this in Safe Mode is just a bug with Disk Utility rather than my drive? There is a post on Electiclight.co dated November 19 2021 which says this - that it's a problem Disk Utility has with APFS drives.


I still have the /Library/Logs/DiagnosticReports/ProxiedDevice-Bridge/Retired - panic-full-2022-04-18-054811.0003.ips to worry about, but so far no more crash/restarts....



Disk Utility/First Aid in Safe Mode shows error not shown when running in Recovery mode

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