How To: Create a Bootable Install DVD or USB Drive of OS X 10.8 Mountain Lion

How To: Create a Bootable Install DVD or USB Drive of OS X 10.8 Mountain Lion

If you have a Mac, you've probably been anticipating the release of OS X Mountain Lion. If you have multiple Macs, you've probably been dreading the long process of downloading and installing it on all of them. Here's how to create a bootable backup disk and save yourself some time. Image via mzstatic.com

Before You StartThe obvious first step here is to download OS X Mountain Lion. But before you do anything else, a word of caution: once you've used the OS X installer, it will automatically delete the file you need to make the backup disk, so you'll want to either make a copy of the installer or create your disk before you upgrade.You can use a USB flash drive, external hard drive, or DVD-R disc, but the USB drive is quicker. If you're using a USB drive, it has to be formatted as "Mac OS Extended (Journaled)" and set to partition type "GUID Partition Table" in order to work. Image via arstechnica.net You can find out more on how to do this here.

The Quick WayIf you want to make the process as painless and automated as possible, there's an app you can use called Lion Diskmaker. Image via arstechnica.net Simply download the app and in a few clicks (and about 30 minutes) your disk will be finished. The app also works with OS X Lion.
The DIY WayIf you'd rather make the disk yourself, you can do it in a few simple steps.

Step 1:Open your Applications folder and right-click on "Install OS X Mountain Lion." Click on "Show Package Contents" and then find the folder called Shared Support. Image via arstechnica.net Once inside, browse to the "Contents > SharedSupport" folder where there will be a file called "InstallESD.dmg." This is the image file that contains the information you need to create the backup disk.
Step 2:Open Disk Utility (located in your Applications > Utilities folder).

Step 3:Drag and drop the "InstallESD.dmg" into the list of drives on the left and select it. This should make it appear in the Source box on the right. If not, you may have to click the "Restore" tab as seen below. Image via arstechnica.net
Step 4:Drag your USB (or a Dual-Layer DVD) drive from the list on the left into the "Destination" box and click "Restore" (or just click the "Burn" button in the upper left if you're using a Dual-Layer DVD) and in 10-30 minutes (depending on whether you're using USB 2.0 or 3.0) you'll have your backup disk ready to instal on as many Macs as you like.
You're Done!If you need help using your disk to restore your Mac, Apple has a helpful page in its Support section.



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