You can now quit Terminal and eject the volume.ĭepending on which macOS you downloaded, enter one of the following commands in Terminal as instructed above. When Terminal says that it’s finished, the volume will have the same name as the installer you’ve downloaded, such as Install macOS Sonoma. Terminal displays the progress as the volume is being erased.Īfter the volume has been erased, you may see an alert stating that Terminal would like to access files on a removable volume. 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. When prompted, type your administrator password. If the volume has a different name, replace MyVolume in the command with the name of your volume. Type or paste one of the commands below Each command 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. Open Terminal, which is in the Utilities folder of your Applications folder. Enterprise administrators: download from Apple, not a locally hosted update server.ĭownload a macOS installer using the App Store or your browser Use Terminal to create the bootable installer Your Mac must also be compatible with the macOS that you’re downloading. To download a full installer, your Mac must be using macOS High Sierra or later, the latest version of macOS Sierra or the latest version of OS X El Capitan. What you need to create a bootable installerĪ USB flash drive or other secondary volume with at least 14 GB of available storage, formatted as Mac OS Extended You don’t need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful if you want to install macOS on multiple computers without downloading the installer each time, or you’re unable to install a compatible macOS from the Finder or macOS Recovery. Follow the instructions when the macOS installer opens.These advanced steps are primarily for system administrators and other experienced users who are familiar with entering commands in Terminal. Select the volume containing the bootable installer, then select ‘Continue’. Hold the power button until you see the startup options window. Make sure this machine is connected to the internet and supports the macOS version you’re installing. Click ‘Continue’ and follow the instructions.įirst, plug the bootable installer into the Mac you wish to install macOS. Select ‘Install macOS’ or ‘Install OS X’ from the Utilities window. Select the volume that contains the bootable installer. Release the ‘Option’ key when you see a dark screen showing your bootable volumes. Press and hold the ‘Option’ key after turning on or restarting the Mac. Plug the bootable installer into a Mac that’s connected to the internet and is compatible with the macOS version you’re installing. The steps are different, depending on whether you're using an Intel-based Mac or one with Apple silicon. It's now time to use the bootable installer to install a fresh copy of macOS. You've made it to the final step of learning how to install macOS from a USB. You've now successfully created a bootable installer that you can use to install macOS on other machines. If asked, click 'OK' to allow the copying of files to proceed. Type 'Y' to confirm that you want to erase the volume, then press 'Return'. Type your administrator password when prompted, then press 'Return' again. Continue with TerminalĪfter pasting the command above, hit the 'Return' key. Change the name in the command to match your settings, if necessary.įor macOS Big Sur, copy and paste the following into Terminal: sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolumeįor macOS Catalina: sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolumeįor macOS Mojave: sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolumeįor macOS High Sierra: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolumeįor OS X El Capitan: sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app 3. With each command, it's assumed the installer is located in your 'Applications' folder and 'MyVolume' is the name of the USB flash drive. The command differs, depending on the macOS version you're going to install. In the next step, you'll enter a command in Terminal. Choose 'Finder' then select 'Go' from the menu bar. Connect the USB flash drive to the computer you wish to install macOS. Once you have your bootable installer ready, it's time to move to the next step.
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