Create DMG Disk Image sudo hdiutil create -o /tmp/disk -size 16384m -volname MacOSMonterey -layout SPUD -fs HFS+J Mount Disk Image sudo hdiutil attach /tmp/disk.dmg -noverify -mountpoint /tmp/disk Create Install Media sudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia --volume /tmp/disk --nointeraction Eject Install Media hdiutil eject /Volumes/Install\ macOS\ Monterey Convert DMG Disk Image to CD/DVD Master hdiutil convert /tmp/disk.dmg -format UDTO -o /tmp/disk Rename For Sanity mv /tmp/disk.cdr /tmp/disk.iso Clean Up mv /tmp/disk.iso ~/Desktop sudo rm /tmp/disk.dmg