Of course, you’ll need to change the file paths if neither of these are true.
The downloaded installer will get stored in your Applications folder. You’re installing macOS Big Sur onto your USB drive. Note that you’ll want to change the placeholder for whatever your USB drive is called: sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/ Open Terminal (found in the Utilities folder) and copy the snippet below. Follow the instructions below for another way to create a bootable installer. It may open and begin to take you through the installation process when it finishes downloading, but you don’t want to do this. Your bootable USB for macOS Big Sur is now ready and can be used as a startup disk to install the OS on any Mac.Given the size of macOS Big Sur (around 13GB), it may take a while. You can now quit Terminal and eject the volume. When Terminal says that it’s done, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. 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 your password. When prompted, type your administrator password and press Return again. Sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia –volu If it has a different name, replace MyVolume in the commands with the name of your volume. 
It 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 the following command in Terminal.
Open Terminal, which is in the Utilities folder of your Applications folder. It will download to your Applications folder as an app named Install macOS Big Sur. If the installer opens after downloading, quit it without continuing installation.Ĭonnect the USB flash drive or other volume that you’re using for the bootable installer. Here’s what you need to do to create a bootable USB drive for macOS Big Sur:ĭownload macOS Big Sur from the App Store here. While you don’t need a bootable installer to upgrade macOS or reinstall macOS, it can be useful when you want to install it on multiple computers without downloading the installer each time.
Once created, you can use the bootable drive as a startup disk to install the operating system on any compatible Mac. Apple has just updated its support page on how to create a bootable USB install drive for macOS with support for its latest Big Sur release.
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