External hard drive won't mount after power blip

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Level 1

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External hard drive won't mount after power blip

After a momentary power interruption this morning, my external hard drive (on which I have a Time Machine backup) does not mount and does not appear in Finder. (It is a LaCie 2TB USB drive.) The device is recognized in System Information and Disk Utility, but an attempt to mount it in Disk Utility returns this error message:

Could not mount “disk2s2”. (com.apple.DiskManagement.disenter error -119930868.)

I have tried First Aid in Disk Utility but it fails. Restarting the computer did not help either.

I have a Mac Mini (Late 2014) running MacOS Big Sur Ver. 11.6.2.

Any suggestions would be appreciated. Thank you!

Mac mini, macOS 11.6

Posted on Jun 24, 2022 3:49 PM

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Answer 1

Best reply

HWTech

Level 9

56,804 points

Jun 24, 2022 6:46 PM in response to Massken

If First Aid is unable to repair the drive, then you will most likely need to erase it and start over with a fresh TM backup.

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Answer 2

PRP_53

Level 10

86,335 points

Jun 25, 2022 3:48 AM in response to Massken

To add to the good advise by @HWTech

Q - " I have a Mac Mini (Late 2014) running MacOS Big Sur Ver. 11.6.2."

A - This Version of Big Sur is somewhat dated as the current version of Big Sur is now 11.6.7

A - It is strongly suggested to perform a Time Machine Backup before attempting the update

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Answer 3

Massken Author

Level 1

14 points

Jun 26, 2022 8:42 AM in response to HWTech

Thank you enormously for your answer. I am not surprised. Now I just need to figure out the best steps for erasure and reformatting for a new TM backup, but I'm sure there's plenty of advice to be found readily with a search or two.

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Answer 4

Massken Author

Level 1

14 points

Jun 26, 2022 8:48 AM in response to PRP_53

Thank you enormously for your comment. Yes, I need to update. I generally keep up with the updates religiously. I can also go to Monterey, but I'd even more like to get a new Mac. Perhaps when the next Minis are introduced.

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External hard drive won't mount after power blip

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