Open Terminal (it is found in the same folder as the Disk Utility app).
Choose GUID Partition Table as the partition scheme and choose OK
This can be done from the Erase tab within the app make sure that there are no multiple partitions (turn to the Partition tab to verify and correct this). Using Disk Utility (it is found in Other under Launchpad),įormat the USB drive as Mac OS Extended (Journaled), and name it Yosemite. OSX 10.10 Yosemite sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ OS\ X\ Yosemite.Connect the USB drive ( 8 GB ) to your Mac. OSX 10.11 El Capitan sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app Launch the Terminal from /Applications/Utilities and enter the command below and then your password when prompted, be sure to change the ‘ MyVolume‘ name in the below command to your external disk name. If in the instance it already says ‘Downloaded’ and it’s not in your /Applications folder, first of all try a search on your machine for it, if still no go, launch LaunchPad in Applications and find the installer, in this instance ‘Install OS X Mavericks’ and move to the Trash – now you should be able to download from the App Store app. If it’s not there check in your purchased tab of the App Store app and you can click Download. If you have previously downloaded either OSX 10.11 El Capitan, 10.10 Yosemite 10.9 Mavericks it should be in your top level Applications folder. This can be useful for downgrading an OS to an earlier version, some older machines don’t run El Capitan that well which users discover after they have upgraded.
It is done via the Terminal from a command Apple introduced since OSX Lion called createinstallmedia , all you need is the original OSX app installer and a spare external drive to make a copy of the new OS installer on which you will be able to boot from. This guide deals with how to make a bootable disk of either OSX 10.11 El Capitan, 10.10 Yosemite or 10.9 Mavericks.
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