This step takes about a half hour depending on your system and drive. Step 9: The Mountain Lion USB Installation drive will now be created. Step 8: Once you have verified that both the Destination and Source fields are populated with the correct info, click the Restore button in the bottom right corner. Step 7: Click the Source box, and then click InstallESD.dmg, which is below the USB drive in the left panel. Step 6: Drag the Mountain Lion USB Key to the box labeled Destination. Step 5: Reopen the Disk Utility, and select the 8GB USB Flash Drive, then click the Restore tab. Afterwards, you can close any open Finder windows. Double click on the InstallESD.dmg image to mount the image. Step 4: Open the Contents folder, followed by the Shared Support folder, and locate InstallESD.dmg. Right click on the app, and select Show Package Contents. This is the Mountain Lion installation app that was downloaded from the Mac App Store. Inside, you should see the following: Install OS X Mountain Lion.app. Step 3: Open a new Finder window, and navigate to the Applications folder. ![]() I suggest naming it something recognizable, like “Mountain Lion Boot Drive”, “Mountain Lion USB Key”, etc. ![]() Step 2: Open the Disk Utility and erase the 8GB USB drive. Step 1: Download OS X Mountain Lion from the Mac App Store.
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