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Several users are complaining that they keep ending up getting the 'Couldn't modify partition map' error on their system while triggering a re-format over partition by corruption. To repair this annoying issue, here are some potential fixes mentioned below.Source :- https://sofiejohn.blogspot.com/2021/09/how-to-fix-couldnt-modify-partition-map.html
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As it turns out, a lot of affected users that were also dealing with this issue on macOS have managed to fix the issue by using Disk Utility to create a new partition map by forcing the utility to show all devices and erasing the problematic partition.
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