Install Mac Os On External Hard Drive [patched] May 2026

sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

You now have a portable, bootable Mac environment. Whether you’re testing a new OS, running legacy software, or simply keeping a disaster recovery tool in your bag, this setup puts you in control. install mac os on external hard drive

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

sudo /Applications/Install\ macOS\ Sonoma.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume (Change “Sonoma” to “Ventura” or “Monterey” as needed) running legacy software

sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume