Here's how to use a free utility, Lion Disk Maker, to create a boot drive for clean installations or emergency use on your Lion- or Mountain Lion-compatible Mac. Create a bootable USB thumb drive like we did, or a bootable DVD.
Navigate to your applications folder and double click on the Lion Disk Maker icon. The app works for both Lion and Mountain Lion. You get to choose the version you want to make a boot disk for once the app starts.
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