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Hello Tom, I tried to repair the macOS Catalina start up disk using disk utility. But when first time the first aid option failed then again run the first aid. Disk utility showed the overlapped extent allocation error. But I could not replace the damaged file. I did not have the backup, and I was to regain my system. I found some software for disk recovery like Stellar Data Recovery for Mac, DiskDrill Data Recovery and Pandora. I downloaded free version of stellar and disk drill. Luck by chance I recovered in first attempt by stellar.
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