Give the drive a name, set the format as OS X Extended (Journaled).Select your main drive from the list on the left.After booting from your bootable USB drive, select Disk Utility.How to wipe your Mac’s hard drive, ready for a downgrade: If you want to install an older version of macOS on your main drive, you need to completely wipe it first. But Apple doesn’t let you downgrade your current version of macOS. If you’re installing to an external drive or a new partition, you can just follow what the installer tells you to do. Select your USB drive and wait until it loads.Keep holding it until you see a choice of boot options.Before the chime, press and hold the Option key.How to use a bootable USB drive on a Mac: To that, you need to select it when your Mac starts up. When you’ve created a bootable USB drive, you can use it to install macOS from. Click Create Installer and wait for Disk Creator to finish Installing an old version of macOS from a USB drive Browse your Mac to find the macOS installer in Applicationsĥ. Select your USB drive under Select the volume to become the installerģ. How to create a bootable disk using Disk Creator for Mac:Ģ. This does the same thing as using Terminal commands but with a simple graphical interface. You can also use the free app Disk Creator to make your bootable USB drive.
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