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Roger Sinden Author

Level 2

152 points

Time Machine disk not mounting

I am having issues with a Time Machine disc. I I try to select it and get asked to Erase (which I confirm) it then fails telling me that it can't unmount the disc. Then a few minutes later get an error message saying that the disc was ejected improperly. I could run First Aid on the drive OK. But now it won't even mount.

If I run Terminal, diskutil list I can see the drive and yet it won't appear in the main GUI DiskUtil interface. I have tried another cable.

iMac, OS X 10.11

Posted on Oct 4, 2022 10:14 AM

Top-ranking reply

Tesserax

Level 10

152,278 points

Posted on Oct 4, 2022 10:20 AM

Disk Utility's First Aid may not always catch everything. I suggest that you consider using DriveDx to get a better picture of the health of this external drive. Optionally, you can post its results here if you need any assistance with interpreting it.

Of course, if it doesn't mount, even DriveDx may not be able to read it. Have you tried connecting it to another device to see if you can still access it that way?

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Time Machine disk not mounting

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