The two methods are similar, though the first, installing on a startup drive, requires a number of extra steps including creating a bootable installer and erasing all data from the startup drive. We’re going to look at two types of clean installs: installing on the current startup drive and installing on a drive that isn’t the startup and doesn’t contain an operating system. So, starting from scratch may be the better choice.
You can restore your user data to a clean install but if you’re going to the effort of wiping your startup drive, you’ve probably been having some type of issue that could come back if you restore from the old data.
It’s like the day you turned on your Mac for the first time. You can now quit Terminal and eject the volume.The downside to a clean install is that not only is the system a new, fresh copy, but your user data is new as well or a better way to put it: all your data is gone, erased. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Monterey.After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume.Terminal shows the progress as the volume is erased. When prompted, type Y to confirm that you want to erase the volume, then press Return.Terminal doesn't show any characters as you type. When prompted, type your administrator password.If the volume has a different name, replace MyVolume in the command with the name of your volume. Each command assumes that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. Type or paste one of the commands below into Terminal, then press Return to enter the command.Open Terminal, which is in the Utilities folder of your Applications folder.
Plug in the USB flash drive or other volume that you're using for the bootable installer.
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