Scroll down and double click on Terminal. You'll also need to ensure that macOS Big Sur is in your Applications folder, and you'll need to know the name of the external drive. Important: You will need to use an administrator account on your Mac to run the Terminal commands to create a boot drive. How to put macOS Big Sur onto your external drive Your thumb drive or external hard drive is now ready. If you have more than one external drive with the same name, you will need to rename the drive you are using as a bootable installer now. Scroll down and double-click on Disk Utility. Select Applications from the list on the left side of the window. You'll need to start with a clean thumb drive or external hard drive to make it a bootable drive.
How to format your external drive for macOS Big Sur
