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In the left-hand pane of Disk Utility you’ll see a handful of drives. Making your USB key bootable With your Lion disk image mounted on the desktop, plug in your USB key and open Disk Utility (I launched it from Spotlight). Right-click (control-click) on the app and select “Show Package Contents.” From here, navigate to the “SharedSupport” folder inside “Contents.” You’ll see a Lion disk image titled “InstallESD.dmg.” Double-click to mount the image, “Mac OS X Install ESD,” on your desktop. Instead, you’ll need to have a look inside that application. As long as you don’t run the installer, you can locate it in your Applications folder.įinding what you need in the Lion installer In your Applications folder you’ll see a file titled “Install Mac OS X Lion.app.” This alone won’t suffice for a bootable USB key. I signed into my iTunes account via another MacBook’s Mac App Store (Store/ Sign In) to re-download Lion. If you have another Mac with the Mac App Store, you can also take advantage of Apple's generous registration policy (Apple allows you to register up to five computers with an iTunes account). If you hold down the "Option" key when you click on the "Purchased" tab of the Mac App Store you'll gain the option to re-download the Lion installer. You, can, however, retrieve it in one of two ways. It’s worth noting that once you run the Lion installer from the Mac App Store, it magically disappears from your computer. What you need to know I took up this challenge after I had installed OS X Lion on my MacBook Pro. Best Hosted Endpoint Protection and Security Software.