Use the ‘createinstallmedia’ command in Terminal
- After downloading the installer, connect the USB flash drive or other volume you’re using for the bootable installer. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
- Open Terminal, which is in the Utilities folder of your Applications folder.
- Type or paste one of the following commands in Terminal. These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you’re using. If it has a different name, replace MyVolume accordingly.
- Big Sur:*
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume — /Applications/Install\ macOS\ Big\ Sur.app
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume
sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume
- High Sierra:*
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install\ macOS\ Sierra.app
- El Capitan:
sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume –applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app
- Press Return after typing the command.
- When prompted, type your administrator password and press Return again. Terminal doesn’t show any characters as you type your password.
- When prompted, type “Y” to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
- When Terminal says that it’s done, the volume will have the same name as the installer you downloaded, such as Install macOS Mojave. You can now quit Terminal and eject the volume.
* If your Mac is using macOS Sierra or earlier, include the –applicationpath argument. The Sierra and El Capitan commands show the proper format of this argument.
Use the bootable installer
After creating the bootable installer, follow these steps to use it.
- Connect the bootable installer to a compatible Mac.
- Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery.
Learn about selecting a startup disk, including what to do if your Mac doesn’t start up from it.
- Choose your language, if prompted.
- A bootable installer doesn’t download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
- Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.
For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:
/Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia
/Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia
/Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia
/Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia
/Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia
/Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia