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You only need to erase the Macintosh HD volume if you aren’t using Catalina. If you’re using Mac OS X Catalina or Big Sur, the procedure is slightly different. Before you can see the volume, you may need to go to View > Show All Drives.

Now choose which volume you want to erase.Click Continue after selecting Disk Utility.Click Disk Utility if you wish to wipe your disk (otherwise you can jump ahead to step 8). Whether you want to wipe the Mac before reinstalling the operating system determines your next step. The Restore From Time Machine Backup, Reinstall macOS, Safari (or Get Help Online in prior versions) and Disk Utility options will appear in the macOS Utilities window.Enter Recovery (on an Intel Mac, press Command+R on an M1 Mac, press and hold the power button as described above).To reinstall the most recent version of macOS on your Mac, follow these steps: When starting up your M1 Mac, press and hold the power button until you see a startup settings window with an Options icon appear. This is no longer the case for Macs that use Apple’s own CPUs, such as the M1 Macs, which were released in November 2020, and the M1 Pro and M1 Max Macs, which were released in October 2021.