How to create a bootable, backup Mountain Lion install disk – Ars Technica

July 25, 2012 Posted By: Leave a comment
Under the partition options, also make sure the partition type is set to "GUID Partition Table," otherwise it won't be able to boot an Intel-based Mac. Drag and drop the "InstallESD.dmg" into the "Source" box in Disk Utility. Then click the ...
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