• 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. • 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.

After, 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. Learn about, including what to do. • 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: Mojave: /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia High Sierra: /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia Sierra: /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia El Capitan: /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia.

A bootable USB drive is a handy tool if you need to reinstall OS X Yosemite on your Mac, or if you're updating other Macs. To create this drive, download the OS X Yosemite installer from the App store and then use a specific command in Terminal to load it onto the USB disk.