You can use an external drive or secondary volume as a startup disk from which to lớn install the Mac operating system.

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

You don"t need a bootable installer toupgrade macOSor reinstall macOS, but it can be useful if you want khổng lồ install macOS on multiple computers without downloading the installer each time, or you"re unable khổng lồ install a compatible macOS from the Finder or macOS Recovery.

USB flash drive or other secondary volume with at least 14GB of available storage, formatted as Mac OS Extended.


Plug in the USB flash drive or other volume that you"re using for the bootable installer.Open Terminal, which is in the Utilities thư mục of your Applications folder.When prompted, type your administrator password. Terminal doesn"t show any characters as you type. Then press Return.When prompted, typeYto confirm that you want to lớn erase the volume, then press Return. Terminal shows the progress as the volume is erased.After the volume is erased, you may see an alert that Terminal would lượt thích to access files on a removable volume. Click OK khổng lồ allow the copy to lớn proceed.When Terminal says that it"s done, the volume will have the same name as the installer you downloaded, such as Install macOS Monterey. You can now quit Terminal và eject the volume.

Depending on which macOS you downloaded, enter one of the following commands in Terminal as instructed above.

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If your Mac is using macOS Sierra or earlier, the command should conclude with--applicationpath followed by the appropriate installer path, as shown in the command below forEl Capitan.

sudo /Applications/Install macOS --volume /Volumes/MyVolume
sudo /Applications/Install macOS --volume /Volumes/MyVolume
sudo /Applications/Install macOS Big --volume /Volumes/MyVolume
sudo /Applications/Install macOS --volume /Volumes/MyVolume
sudo /Applications/Install macOS --volume /Volumes/MyVolume
sudo /Applications/Install macOS High --volume /Volumes/MyVolume
sudo /Applications/Install OS X El --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X El