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How To Burn OS X Mountain Lion To A Flash Drive or DVD

How To Burn OS X Mountain Lion To A Flash Drive or DVD

How to create you're own bootable OS X Mountain Lion USB flahs drive or DVD...

Apple’s new operating system OS X Mountain Lion is already available for download from the App Store. But not everyone is connected to the Internet 100 percent of the time, and that can pose a problem should you need to reinstall the OS when you don’t have access to the App Store.

If you’d like to create your own bootable OS X Mountain Lion DVD, or USB flash drive so you can perform a clean install without the Internet, here’s how to do it using the Mac’s built-in Disk Utility.

create bootable apple os x mountain lion usb flash drive or dvd

How To Create A Bootable OS X Mountain Lion USB Drive Or DVD

While burning a DVD or copying files to a flash drive is straightforward task, creating a bootable version of OS X requires a little extra work.

First off, anyone who has installed OS X will have noticed that the installer file disappears from the Applications folder once the installation is complete.

It is possible to get this file back by holding down the ‘option’ key whilst clicking on the ‘Purchase’ tab to re-download the file, or by restoring it from a Time Machine backup. But in order to save time, its best to copy before you run the install.

How To Create A Bootable DVD or USB Flash Drive For OS X Mountain Lion

(This exact method can be used to create a bootable disk for OS X Lion.)

  • 1. Download Mountain Lion from the App Store.
  • 2. Locate the install package in the ‘Applications’ folder and right click (Ctrl + Click, two finger click). Navigate to Contents > SharedSupport and look for the file called ‘InstallESD.dmg’
  • 3. Open Disk Utility from your Applications> Utilities folder and drag the DMG file into the sidebar on the left.
  • 4. If you wish to burn the files to a DVD insert your disk now, select the DMG file in the sidebar, and click ‘Burn’ – skip to step 6.
  • 5. If you’re burning the files to a USB flash drive you’ll need to format the disk.
    • To do this, insert the drive, and select it from the side bar menu in Disk Utility.
    • Select the partition tab and choose ‘1 Partition’ from the drop down menu, then click ‘Mac OS Extended (Journaled)’.
    • Click the ‘Options’ button and select “GUID Partition Table” – this makes the drive bootable. Note that any information on the drive will be completely erased.
    • Finally, click the ‘Restore’ tab and select the DMG file as your source and the USB drive as the destination. Click ‘Apply’ to copy the files.
  • 6. Once the files are copied you can boot from your install disk by restarting your Mac and holding down the ‘Option’ key when you hear the startup chime.

Related Posts:


  1. Melanie Pinola: How to Burn OS X Mountain Lion to a DVD or USB Flash Drive. Lifehacker, 07/25/2012.
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