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On Yosemite 10.10 Onyx returns the following error:
Error: -69845: File system verify or repair failed Underlying error: 8: POSIX reports: Exec format error The disk needs to be repaired.
I tried repairing the disk in recovery mode but the disk utility returns a message that everything is fine, however, the after running Onyx the second time the error persists.
On a related matter, the option to repair permissions is not available in the Disk Utility.
I had the same issue. I was able to fix it in an interesting way.
I have been testing El Capitan on an external drive. So, I thought, why not try Disk Utility using OS 10.11.x and (after the second pass) it repaired the drive. As the Beta was on a separate disk, and the Macintosh HD was unmounted at the time, it was analyzed and repaired. Just like using a 3rd party app.
At least this was a "free" way to fix it. Saved the hassle of reformatting and restoring.
Disk Utility will not fix every conceivable disk corruption issue. For that you need third-party apps. I use Diskwarrior and have also had success with Drive Genius.
However there is one way to do this without buying a disk repair utility. Back up your hard drive, partition/reformat it, reinstall the OS and restore your backup. Yeah it's more complicated and a bit of a PITA but will save you money.
69845 would help to identify the problem precisely.
This was a problem for me too. I booted from an external disk (USB stick in fact), ran disk utility, then Onyx found no problems.
It because Disk Utility doesn't recognize all errors.
I had the same issue before, and I fixed it by following the instructions on the onyx's Known Problem page and this guide to run
fsck -fy
under Single User mode
