Make Bootable OS 10.8 Mountain Lion USB Install Drive

Read the tutorial on creating a bootable OS X 10.8 Mountain Lion USB installation drive

After many inquiries from our users, here is a guide on how to create a bootable OS X 10.8 Mountain Lion USB installation drive.

OS X 10.8 Mountain Lion is offered exclusively through the App Store, a familiar area for Apple as OS X Lion was also offered. Fortunately, it is still possible to create a bootable OS X 10.8 Mountain Lion installer from any USB drive, be it a flash key or an external hard drive.

By creating a bootable installation drive, you can perform clean OS X 10.8 installations, install them on separate partitions, and install OS X Mountain Lion on Macs that don’t have an Internet connection. We’re going to walk through the process here, but don’t forget to check the OS X 10.8 system requirements for the target Mac before you begin.

If you have already extracted the DMG for installing Mac OS X Mountain Lion, skip these first steps and continue creating the following bootable CD.

Download OS X Mountain Lion and extract the DMG file

  1. Download OS X 10.8 Mountain Lion from the App Store
  2. Go to the / Applications / directory and right click on “Install Mac OS X Mountain Lion.app” and select “Show Package Contents”.
  3. Open the “Contents” folder, then “SharedSupport”. Look for a file named InstallESD.dmg.
  4. Double-click InstallESD.dmg to place it on the desktop

Create the OS X Mountain Lion installation drive

    1. Launch Disk Utility and connect a USB drive to the Mac
    2. Select the USB drive from the left menu and click the Erase tab, choose Mac OS X Extended (Journaled) as the format, then click the Erase button in the corner

Format the drive as bootable for Mac OS X Mountain Lion

    1. Now select the formatted USB drive on the left and click on the “Recover” tab
    2. Drag the previously mounted Mac OS X Install ESD image into the Source section
    3. Drag the formatted partition to the Destination area and click Recover.

Build the OS X Mountain Lion installer

  1. Make sure the USB drive has lost its data and enter the administrator password when prompted

Disk Utility will now use the hard disk image to create a bootable OS X Mountain Lion installation drive from the USB drive. This can take a while depending on how fast the drive and Mac are. However, 20 to 30 minutes are not uncommon.

When you’re done, restart your Mac and hold the Option key to bring up the Start menu:

Mac home screen

Select the orange option “Mac OS X” and you will start the OS X Mountain Lion installer. From here the installation is the same as normal. Click Next, select the destination drive and install it.

Install OS X Mountain Lion

How do I create a bootable OS X 10.8 Mountain Lion USB installation drive?

 

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How to Create a Bootable USB Installation Drive for OS X 10.8 Mountain Lion: Benefits

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How to create a bootable USB installation drive for OS X 10.8 Mountain Lion: FAQ

Tutorial Summary: How to Create a Bootable USB Installation Drive for OS X 10.8 Mountain Lion

In this guide, we showed you how to create a bootable USB X installation drive for OS X 10.8 Mountain Lion. Please read all of the steps so that you understand how to create a bootable USB installation drive for OS X 10.8 Mountain Lion, if you need any assistance from us, please contact us.

How does this tutorial help you?

So this guide is going to explain how to create a bootable USB installation drive for OS X 10.8 Mountain Lion that will undoubtedly help you.

In what actual time is this method completed?

The time to complete the tutorial on creating a bootable OS X 10.8 Mountain Lion USB installation drive is more than 10 minutes.

What is the supported device?

What is the supported operating system?

 


Creating a Bootable Operating System X 10.8 Mountain Lion USB Installation Drive Tutorial: last note

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Rakesh Chadda
Trickbugs: Tips and Tutorials
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