![]() ![]() If you want your Mac to start up again from the volume you just you erased, select Reinstall macOS in the utilities window, then click Continue and follow the onscreen instructions.Make a Time Machine backup of your files, apps, and settings on an. When done, quit Disk Utility to return to the utilities window. Quick Summary To Erase And Reinstall macOS Reformatting your Mac requires careful planning. ![]() Optional: If you previously used Disk Utility to add internal volumes other than Macintosh HD, you can erase them individually using the same process.If this button isn't shown, click Erase instead. Before wiping the hard disk, create a backup with Apple's Time Machine or a third-party backup app. You should now see the macOS Utilities window. ![]() If requested, enter your admin password to confirm the action. As the system is restarting, hold both the Command () and R keys on the keyboard at the same time until you see the Recovery Mode window. macOS Big Sur or earlier: Press and hold Command+R > go to macOS Utilities, select hard disk, and erase. In the Apple menu in the top left corner of the screen, choose Restart.
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