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heartstrings

macrumors newbie
Original poster
Dear community,

I have a very perculiar issue with Open Core Legacy which I hope there might be a solution. On my iMac 2017 21.5, I recently replaced the internal hard drive (1tb) with a 4TB SSD. It was slow and running an older version of MacOS Venturand half full (aprox. 500gb). Due to its thunderbolt ports, I was able to work comfortably for several years by installing MacOS on an external 500gb SSD as my main volume while using the slower internal harddrive mainly for extra storage. When I finally upgraded to the 4TB internal SSD, I decided to partition the 4TB (3.5TB / 500GB) whereby the contents of the 500gb external SSD was cloned into the 3.5TB partition and the internal hard disk into the smaller 500GB partition. Having done that I decided to apply Open Core Legacy on the bigger 3.5TB partition to be able to run the latest unsupported MacOS Sequoia. Everything went well except that the smaller 500gb partition is no longer mountable. It shows up as disk4s3 on my disk utility. I'm able to retrieve individual files like pictures and documents using 3rd party recovery softwares but I'm wondering if it's still possible to restore the full working partition because my iMovie library was stored in that partition. I hope there's someone in the community who may have experienced the same issue and found a solution.
 

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Have you tried running First Aid?
"For each device that you're repairing, start by selecting the last volume on that device.
...
After Disk Utility is done checking the volume, select the next item above it in the sidebar, then run First Aid again. Keep moving up the list, running First Aid for each volume on the device, then each container, then finally the device itself."
https://support.apple.com/en-us/102611
 
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