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TOPIC: TTPro 11 can't repair volume

TTPro 11 can't repair volume 24 Jul 2019 10:40 #11269

TTPro 11 (from eDrive) indicates problem with fsroot tree on my boot drive. Volume structures test gives error result 8. (I had also gotten error result 9 prior to creating eDrive and running from eDrive.) Disk utility error is below. Attempts to repair didn't work. What should I try now? System is High Sierra.

Disk utility error was:

Verifying file system.
Volume could not be unmounted.
Using live mode.
Performing fsck_apfs -n -l -x /dev/rdisk4s1
Checking volume.
Checking the container superblock.
Checking the EFI jumpstart record.
Checking the space manager.
Checking the object map.
Checking the APFS volume superblock.
Checking the object map.
Checking the fsroot tree.
Checking the snapshot metadata tree.
Checking the extent ref tree.
Checking the snapshots.
Checking snapshot 1 of 25.
Checking snapshot 2 of 25.
Checking snapshot 3 of 25.
Checking snapshot 4 of 25.
Checking snapshot 5 of 25.
Checking snapshot 6 of 25.
Checking snapshot 7 of 25.
Checking snapshot 8 of 25.
Checking snapshot 9 of 25.
Checking snapshot 10 of 25.
Checking snapshot 11 of 25.
error: inode_val: object (oid 0x3): invalid nchildren (-1)
Snapshot is invalid.
The volume /dev/rdisk4s1 could not be verified completely.
File system check exit code is 0.
Restoring the original state found as mounted.
Operation successful.
The administrator has disabled public write access.

TTPro 11 can't repair volume 24 Jul 2019 12:35 #11270

Thanks for your clear and detailed report.

I am not certain what else can be done in terms of repair. Please send your report to This email address is being protected from spambots. You need JavaScript enabled to view it. . You will receive a reply by email. At the least, the programmers may be able to give an indication of how serious the diagnosis of an invalid snapshot is. It may be possible to delete the defective snapshot, but I cannot provide guidance on that.

In the meantime, it would be a good idea to run the Surface Scan to check the drive for unremapped bad blocks. Thank you.
MicroMat Inc
Makers of TechTool
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