Once that’s deleted, you’ll then need to erase the System volume, by selecting it at the left and clicking on the Erase tool. In Recovery Mode select the Macintosh HD - Data volume at the left of Disk Utility’s window then use the Delete APFS Volume command from the Edit menu, or use the shortcut by clicking the – tool. To perform a clean re-install in Catalina, once in Recovery Mode, you need to delete your Data volume, that’s the one named Macintosh HD - Data, or something similar if you’re using a custom name, and to erase your System volume. Because you want to re-install macOS, the logical thing to do would be to wipe the System volume, which suggests that you could get away with retaining your own files on the Data volume through a clean re-install. 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. Select "Disk Utility" and click "Continue.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. After a few moments, the macOS Utilities window should appear - this is known as Recovery Mode.Ĥ. Keep holding it until you see either the Apple logo, or an animation of a spinning globe.ģ. Press the power button to turn it on, then immediately press and hold Command (⌘) + R. Once you're ready to wipe your Mac, do the following:Ģ.
If you're giving your computer away, also make sure that you've signed out of iTunes, iCloud, and iMessage - there's a chance your Apple ID data will remain on the drive after you reset it, and you don't want anyone gaining access to your account. You can also backup onto iCloud, or manually move the files you want to save onto an external drive. You can do this through Time Machine, Apple's official backup application, which will copy all your files onto an external drive. Check out the products mentioned in this article: MacBook Pro (From $1,299.99 at Best Buy) How to wipe a Mac computer with a factory resetīefore anything, if you don't want to lose the files you have saved on your computer, you should back them up.
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