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Ursprünglicher Beitrag von: Dan ,


The best thing here is to create a USB OS installer drive to redo the drive. Of course make a TimeMachine backup of your user accounts, apps & data so you can restore them later.

Catalina is still a bit buggy! So make sure you apply all of the updates afterwards or just go back the Mojave for now.

* [https://www.macworld.com/article/3284378/how-to-create-a-bootable-macos-mojave-installer-drive.html|How to create a bootable macOS Mojave installer drive]
* [https://www.macworld.com/article/3442597/how-to-create-a-bootable-macos-catalina-installer-drive.html|How to create a bootable macOS Catalina installer drive]

You will want to boot up under it using the '''Option''' key to enter into the Startup Manager

Then delete all of the partitions via Disk Utility and then reformat the drive to GUID with APFS file system. Then re-install macOS.