How do delete a internal hard-drive partition?
I accidentally partition my HD on Mac pro. Now I have a HD hard-drive and a HD DATA hard-drive.
I tried to delete HD hard-drive using disk utility, but the option is greyed out.
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that is a new feature in Big Sur. Your hard drive now has two volumes, one contaons the OS and system and is not accessible and the other is Mac HD Data and contains your user files and apps. Do not attempt to delete that or you will lose all data.