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1. #Make a bootable installer for os x mountain lion how to#
2. #Make a bootable installer for os x mountain lion mac os x#
3. #Make a bootable installer for os x mountain lion mac os#
4. #Make a bootable installer for os x mountain lion install#

If you’ve already purchased OS X, open the Mac App Store and head over to the “Purchases” tab. Note that you can always re-download the version of OS X that came with your Mac for free.Īs of the date of this article, OS X 10.8 Mountain Lion is the current OS, although the recently-announced OS X 10.9 Mavericks is right around the corner.

#Make a bootable installer for os x mountain lion how to#

Here’s how to create your own USB or DVD Installer for OS X.įirst, you’ll have to purchase a copy of OS X from the Mac App Store if you don’t already have one. This approach brought many benefits, such as not having to keep and safeguard a physical disc, immediate access to the OS when purchased instead of having to wait in line, and server-side updates to the downloadable installer so that the most current version of OS X is always installed when updating new machines.īut what if you’ve just installed a new hard drive in your Mac and have no version of OS X with the Mac App Store? Or what if you don’t have a reliable Internet connection? In these cases, it’s always best to have a physical local copy of the OS X installer. Instead of a traditional disc, customers could now purchase and download OS X directly from the Mac App Store. With the release of OS X 10.7 Lion in 2011, Apple officially abandoned physical media for its operating system installations. For OS X Mavericks, see this updated process.

#Make a bootable installer for os x mountain lion install#

Simply select the “Mac OS X Installer” you just created on your USB drive and you will be ready to install OS X Mountain Lion on your Mac.UPDATE: Apple has changed the process for creating a USB installer with OS X Mavericks and the method below no longer works. You will be presented with a list of drives. When you boot your Mac, be sure that the USB thumb drive is inserted, and hold down the option-key when the Mac starts up. Once the process is complete, you will have your own backup installer for OS X Mountain Lion that you can use to install on your Mac, or restore it should something go terribly wrong. Click on the Restore button once everything is set correctly.Īnd that’s it. If you do not see the “InstallESD.dmg” file listed, use the Image button and locate it on your desktop. You can drag and drop the items in the list on the left of the Disk Utility, into their appropriate Source and Destination settings on the right.

Then set the Destination to be the “Mac OS X Installer” partition you created in step two.

You want to set the Source as the “Mac OS X Installer ESD,” which is located within the “InstallESD.dmg” file you copied in step one. Now select the “Mac OS X Installer” you created in step two, and click on the Restore tab to the right.

#Make a bootable installer for os x mountain lion mac os#

Select Mac OS Extended (Journaled) as the Format, set the Name to “Mac OS X Installer” and click on the Erase button. Make sure there are no files you need on the drive, then select the USB drive, and click on the Erase tab to the right.

Once it is running you will see a list of the mounted drives connected to your Mac. Launch the Disk Utility application located in your Application’s Utilities folder. Take a thumb drive that has at least a 8GB capacity, and connect it to your Mac. This file is a bootable disk image of OS X with the Mountain Lion Installer already installed.

#Make a bootable installer for os x mountain lion mac os x#

The following is a quick guide to help you create a USB installer for Mountain Lion, very similar in fact to the OS X Lion USB Thumb Drive Apple use to sell with previous versions of OS X.Īfter purchasing and downloading the OS X Mountain Lion update and before actually updating your Mac, navigate to your Applications folder in the Finder and right click on the file “Install Mac OS X Mountain Lion.app” and select “Show Package Contents.” Look in the “Shared Support” folder located under the “Contents” folder of the “Install Mac OS X Mountain Lion.app,” and copy the file named “InstallESD.dmg” to your desktop. But there are times when it’s more useful to have a means to install OS X from an external source. Perhaps you have a fast broadband connection at home or work and downloading multiple copies of OS X Mountain Lion(s AAPL) from the Mac App Store to update a few computers is not an issue.