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I woke up the other morning to a prohibitory icon (circle with a line through it) on my iMac. I believe this was due to a failed Catalina update but I am not sure. I had it set to auto-update.

I am getting some strange results. I have booted into recovery mode and have a bootable flash drive as well as a 2T external drive that will also boot. I can not mount the main partition disk0s2. When I select that and click 'mount' it does nothing.

When I first boot into recovery mode then go to Disk Utility, there are a couple drives that are in RED. Then after I 'ignore' the fix that will delete all my data, they turn black (the normal text color).

I tried to continue the installation and I have gotten a few different issues tahat all amount to not being able to select my main drive.

The weirdest thing is that this is a 3T drive but in Disk Utility it is showing that it's 123.33GB.

Disk Utility after running Verify Disk

Here are the results of running:

diskutil list

diskutil list

and gpt -show /dev/disk0

enter image description here

Any help would be greatly appreciated.

  • Can anyone help me here? I am actually willing to hire someone even. I'm getting desperate and not 100% where to turn at this point. – TKK Jun 8 at 17:13
  • The iMac has a Fusion drive of a 128GB and a 1, 2, or 3TB spinning HDD. That second internal drive isn’t showing, leading me to believe it’s dead. What model iMac is it specifically? – Allan Jun 8 at 17:40
  • It's an iMac15,1. I added some hardware information above. What do you think? – TKK Jun 8 at 22:40
  • In the future, just type out “27” 2015 iMac running Catalina 10.15.4. Pictures can’t be searched and we have to go offsite to see what iMac15,1 refers to. iMacs still come with a spinning drive, so I’m positive yours did as well. The internal 3 TB drive has died (or the SATA controller on the logic board). You’re going to have to open it up and swap that drive. I’d put in an SSD for a huge performance boost – Allan Jun 9 at 0:15
  • Will do, sorry about that and thanks for the shorthand there. Can you please give me some ideas on how I might possibly recover the data on this drive? – TKK Jun 9 at 2:35

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