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 done, the volume will have the same name as the installer you downloaded, such as Install macOS Sonoma. Terminal shows the progress as the volume is erased.Īfter the volume is erased, you may see an alert 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. 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. Type or paste one of the commands below into Terminal, then press Return to enter the command.

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 14GB 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. These advanced steps are primarily for system administrators and other experienced users who are familiar with entering commands in Terminal.

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