sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Mavericks.app --nointeraction From http://arstechnica.com/apple/2013/10/how-to-make-your-own-bootable-os-x-10-9-mavericks-usb-install-drive/