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I have a Mac Air. I want to erase the HD and reinstall the operating system, but when I go into Disk Utlitiy in Recovery mode, my HD is grayed out and I can't erase it. Is there something I should be doing that I am not? thanks!
Try this article to double-check your steps: How to reinstall macOS from macOS Recovery - Apple Support
Try this article to double-check your steps: How to reinstall macOS from macOS Recovery - Apple Support
Trying to erase HD and relay operating system
