You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

volume structure error

I use an app called CheckMate from MicroMat. It checks my 2019 iMac 27" hardware on a regular basis. Lately, it has shown a volume structure error. I have tried to use Disk Utility First Aid, but it fails. Here are the results:


Running First Aid on “Macintosh HD” (disk3s1)

Verifying the startup volume will cause this computer to stop responding

Verifying file system.

Volume could not be unmounted.

Using live mode.

Performing fsck_apfs -n -l -x /dev/rdisk3s1

Checking the container superblock.

Checking the fusion superblock.

warning: container has been mounted by APFS version 1677.50.1, which is newer than 1412.141.1

warning: disabling overallocation repairs by default; use -o to override

Checking the EFI jumpstart record.

Checking the space manager.

Checking the space manager free queue trees.

Checking the object map.

Checking the Fusion data structures.

error: fusion middle tree: invalid "from" range 0x400001c95f5ca:40

Fusion data structures are invalid.

The volume /dev/rdisk3s1 could not be verified completely.

File system check exit code is 8.

Restoring the original state found as mounted.

File system verify or repair failed. : (-69845)

Operation successful.


Running First Aid on “Macintosh HD - Data” (disk3s5)

Verifying the startup volume will cause this computer to stop responding.

Verifying file system.

Volume could not be unmounted.

Using live mode.

Performing fsck_apfs -n -l -x /dev/rdisk3s5

Checking the container superblock.Checking the fusion superblock.

warning: container has been mounted by APFS version 1677.50.1, which is newer than 1412.141.1

warning: disabling overallocation repairs by default; use -o to override

Checking the EFI jumpstart record.

Checking the space manager.

Checking the space manager free queue trees.

Checking the object map.

Checking the Fusion data structures.

error: fusion middle tree: invalid "from" range 0x400001c95f5ca:40

Fusion data structures are invalid.

The volume /dev/rdisk3s5 could not be verified completely.

File system check exit code is 8.

Restoring the original state found as mounted.

File system verify or repair failed. : (-69845)

Operation successful.


Previous conversation with Apple Support suggested erasing the drive and restoring. I used disk utility to erase and restore from a Time Machine backup. The restore went fine, however, the error is still there.


I tried to use TechTools Pro 13, but it doesn't support APFS format. I also used the Apple Diagnostic to check the hardware, but it found no errors.


Any suggestions would be helpful.



Posted on Dec 11, 2020 6:57 AM

Reply
Question marked as Top-ranking reply

Posted on Dec 11, 2020 5:02 PM

Solution was to reconnect the two Fusion drive components with a script in Terminal. The process only took a few minutes and is done from the Recovery mode. The instructions are here: support.apple.com/en-us/HT207584

Similar questions

1 reply

volume structure error

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.