When Terminal says that it's finished, the volume will have the same name as the installer you've downloaded, such as Install macOS Monterey.After the volume has been erased, you may see an alert stating that Terminal would like to access files on a removable volume.Terminal displays the progress as the volume is being 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.* If your Mac is using macOS Sierra or earlier, include the -applicationpath argument and installer path, similar to the way this was done in the command for El Capitan. Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app Sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume Sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume I have downloaded and saved macOS Mojave installation file from the Mac App Store into my external hard drive. Sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume Sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume then access the App Store for other free installers, such as Catalina and Mojave. Sudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume If it has a different name, replace MyVolume in these commands with the name of your volume. These assume 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 one of the following commands in Terminal.
Open Terminal, which is in the Utilities folder of your Applications folder. There are many ways to Create Bootable USB mac osx installer, but I am going to explain only useful information here.Using a USB disk boot utility makes things much easier. Connect the USB flash drive or other volume that you're using for the bootable installer. Although Apple provides instructions for creating a bootable installer for macOS including links to the DMG files for macOS El Capitan, High Sierra, Mojave, Catalina and Big Sur, it’s quite complicated for most users as it requires using Terminal.