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After my time machine backups got stuck to finish at some point, I decided to do a disk check using disk util.

I'm getting the following output while running "verify disk":

The volume 86A26AC7-8D39-4917-AF77-2F25314852EA appears to be OK Storage system check exit code is 0. Verifying file system. Using live mode. Performing live verification. Checking Journaled HFS Plus volume. Checking catalog hierarchy. (It should be 28985392 instead of 28450688) File system check exit code is 8. Error: This disk needs to be repaired using the Recovery HD. Restart your computer, holding down the Command key and the R key until you see the Apple logo. When the OS X Utilities window appears, choose Disk Utility.

Unfortunately restarting into recovery mode and running "repair disk" doesn't find any errors at all. I've even booted into single user mode for running fsck also without any results - disk was reported as OK. It seems that the FS error only happens after regular booting up.

Disk is a SSD in MBP on Yosemite. Seems to work fine beside this error and stuck backups.

Any ideas to to fix this FS issue?

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Try repairing only your back up> select> disk(external) in Disk Utility>First aid > Repair disk permissions> and see if problem resolves!

  • Repair for the backup disk runs through just fine without reporting any errors. I think the reason for the failing backup is due to the actual error with the root disk, that will eventually cause the backup process to get stuck when reading from erroneous filesystem parts. – spod Feb 28 '15 at 18:05

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