First Aid Failed.

Started 5 months ago | Discussions thread
lightandaprayer Senior Member • Posts: 4,001
Re: First Aid Failed.
1

Tom_N wrote:

"8 indicates a corrupt filesystem was found during a check, or repairs did not succeed. That's it."

You might be able to repair the filesystem using fsck from the CLI in single-user mode.

https://phonegnome.com/file-system-check-exit-code-is-8-2/

In the past, some commercial third-party tools have had much better success than Disk Utility at fixing corrupted filesystems. I have read that in recent versions of macOS, many of these tools now have their own GUIs – but call a common macOS API to do the repair work, possibly erasing some of their former advantages.

DiskWarrior should be able to fix it as long as the external drive is not APFS. Back in the El Cap days DW was superior to Apple's Disk First Aid.

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