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Boot disk mac mountain lion

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The USB device will be erased and partitioned.

A note on installer compatibility

When that process is complete, the flash drive is now ready for use as a bootable device for OS X Mountain Lion. Share Pin Email.

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Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. He is the president of Coyote Moon, Inc. A dual-layer DVD. This type of DVD has two layers, which increases the available recording space to roughly 8. Please note that you must create the bootable copy of the installer before you actually perform the Mountain Lion installation because the Mountain Lion setup process deletes the files you need to make the bootable installer copy.

How to make a bootable Mountain Lion install drive

You will see a folder named Contents in the Finder window. You should see a file named InstallESD. Right-click the InstallESD. Close the Finder window and return to the Desktop. Right-click on an empty area of the Desktop and select Paste Item from the pop-up menu. Pasting the item to the Desktop can take a bit of time, so be patient.


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The app also works with OS X Lion. Drag and drop the " InstallESD. This should make it appear in the Source box on the right.

How to create a Bootable USB installer drive for Mountain Lion

If not, you may have to click the " Restore " tab as seen below. If you need help using your disk to restore your Mac, Apple has a helpful page in its Support section. When following these instructions we got a persistent error message when restoring the boot image to the USB partition, "Restore Failure Could not restore — Invalid argument". However it appears that this has no effect on the restore, and the USB is usable afterwards. Yes, you can ignore this error.

Our goal is here to keep a soft copy of the installer and in the flash drive. Double-click InstallESD.

OS X Recovery Disk Assistant v

This may take a minute or two. Plug in the flash drive into your Mac and launch the Disk Utility application. You can do it quickly by searching via Spotlight. This will remove everything in the flash drive. Keep a backup of the files within if you still need them, then come back to this section.

How to Clean Install OS 10.8 Mountain Lion

Once the flash drive is formatted, re-select the formatted USB drive from the left menu, and click the Restore tab. Do the following steps carefully:. First, a reboot!


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  • Make the OS X Mountain Lion Install Drive.