Make Bootable OS 10.8 Mountain Lion USB Install Drive

Check tutorial of How to Make a Bootable OS X 10.8 Mountain Lion USB Install Drive

So after a lot of requests from our users here is a guide about How to Make a Bootable OS X 10.8 Mountain Lion USB Install Drive.

OS X 10.8 Mountain Lion is offered exclusively through the App Store, familiar territory for Apple since OS X Lion was similarly 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’ll walk through the process here, but don’t forget to check the OS X 10.8 system requirements for the target Mac before getting started.

If you’ve already extracted the Mac OS X Mountain Lion installation DMG, skip this first set of steps and go straight to creating the bootable disc below.

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 and then open “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 Install Drive

  1. Launch the 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 “Erase” button in the corner
  3. Format Drive as bootable for Mac OS X Mountain Lion

  4. Now select the formatted USB drive on the left and click on the “Recover” tab
  5. Drag the previously mounted image from “Mac OS X Install ESD” to the “Source” section
  6. Drag the formatted partition to the ‘Destination’ section then click on ‘Recover’
  7. Create the OS X Mountain Lion installer

  8. Confirm that the USB drive is losing its data and enter the administrator password when prompted

Disk Utility will now create a bootable OS X Mountain Lion installation drive from the USB drive using the disk image. This may take a while depending on how fast the drive and Mac are, but 20-30 minutes is not uncommon.

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

Mac startup screen

Select the orange “Mac OS X” option and you will boot into the OS X Mountain Lion installer, from here the installation is the same as normal. Click Continue, select the destination drive and install.

Install OS X Mountain Lion

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How to Make a Bootable OS X 10.8 Mountain Lion USB Install Drive: FAQ

Tutorial Summary: How to Make a Bootable OS X 10.8 Mountain Lion USB Install Drive

In this guide, we told you about How to Make a Bootable OS X 10.8 Mountain Lion USB Install Drive; please read all steps so that you understand How to Make a Bootable OS X 10.8 Mountain Lion USB Install Drive in case if you need any assistance from us, then contact us.

How this tutorial helping you?

So in this guide, we discuss the How to Make a Bootable OS X 10.8 Mountain Lion USB Install Drive, which undoubtedly helps you.

What is actual time in which this method complete?

The time to complete the How to Make a Bootable OS X 10.8 Mountain Lion USB Install Drive tutorial is 10+ minutes.

What are the supported Device?

Apple

What are the supported Operating system?

mac OS


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