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How to fix external hard drive disk mount error?

Hello. After installing Catalina from the Sierra operating system onto my desktop iMac, noticing issues with all Lacie Porsche External Hard drives - Format: Mac os Extended (Journaled), they do mount and when opened everything works fine. However, in Disk Utility when checking First Aid, I am getting the error: First Aid failing - Unable to unmount volume for repair: (-69673). They do eject okay and have no corruption after checking them on my MacBook Air with the High Sierra operating system. So, it's obvious Catalina is the problem. Gotta be a better remedy besides returning to Sierra! Help most appreciative...

Best Answered by

iBoysoft author Eudora Liu

Eudora Liu

Answered on Wednesday, November 22, 2023

Unable to unmount volume for repair: (69673) occurs due to a volume that could not be unmounted. Before proceeding to fix the drive, you should back up or recover your data.

You can use iBoysoft Data Recovery for Mac to get help, which is a powerful tool that can help you recover kinds of files from USB flash drivesSD cards, HDDs, and SSDs.

  1. Free download and launch iBoysoft Data Recovery for Mac.
  2. Choose your external hard drive and click Search for Lost Data.
  3. Preview the search result and click Recover.
  4. Check if you get back all the data.

After you get back your data, you can take the following ways to fix Unable to unmount volume for repair: (69673). Make sure you have closed all the programs running on Mac.


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