Install Mac Os On External Hard Drive Direct

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 install mac os on external hard drive

Carbon Copy Cloner (free trial, highly recommended) or SuperDuper! (free version available). sudo /Applications/Install\ macOS\ Catalina

sudo /Applications/Install\ macOS\ Sonoma.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume (Change “Sonoma” to “Ventura” or “Monterey” as needed) install mac os on external hard drive