![]() The first of those is the read-only System volume, and the second the read-write Data volume. ![]() Try this in Catalina and the first thing you’ll realise is that you don’t just have a single boot volume now, you’ve got two, one called something like Macintosh HD, the other Macintosh HD - Data. What determines the source and version of macOS to be re-installed are the keys you hold down to enter the mode in the first place. ![]() You boot into Recovery Mode, use Disk Utility there to wipe your boot volume, then re-install macOS from the main window. In Mojave and earlier, a clean re-install is straightforward if time-consuming. It’s clean because it isn’t simply installed on top of your existing files, and it’s a re-install because those system files are there already. ![]() When you need to go back to square one and return to a ‘clean’ installation of macOS, simply re-installing macOS is insufficient: what you need is a clean re-install. ![]()
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