![]() ![]() While most Macs can boot from Thunderbolt or FireWire, USB is the only ubiquitous interface that every Intel Mac includes, so there's no point using anything else other than USB. I'm using a 120GB USB drive for the purposes of this guide. Should this occur, you'll need to sign in to the Mac App Store on another, older, Mac and download the installer on it first. I was unable to download OS X Lion on my Retina MacBook Pro, instead greeted with an error message. From here, they can still be downloaded.ĭepending on the age of your Mac, you may not be able to download older installers for OS X if your Mac is relatively new. If you have purchased the installers previously but no longer have them on your Mac, launch the Mac App Store and select the Purchased tab. Each person's requirements will likely be different so I'll just demonstrate how to build a basic triage drive that you can build upon.įinally, it will be assumed that you have previously purchased OS X Lion and Mountain Lion, or at least have the full installer app available within your Applications folder. With this, we can place individual installs of Mac OS X onto each volume to support a wide range of Macs that may not all support the same version of OS X.ĭepending on your requirements, you may need a bootable installation of OS X Lion or Mountain Lion.
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