Free clean install Mac OS X Mountain Lion 10.8

This post will help you with installation guideline of Mac OS X Mountain Lion on Mac machine only not on pc. Before following the steps please make sure that your system configuration matches with minimum hardware requirement of Mountain Lion version. I am assuming that you have a Windows machine which will prepare installation media of fresh Mac OS X Mountain Lion but if you are upgrading from previous version then Windows is not mandatory requirement.

Step 1

Get an installation image

You can either download it from apple store which costs about $20 or go to any torrent hosting site like piratebay and search for "Mac OS X Mountain Lion" and download .iso or .img or .dmg file. It will take some time to finish downloading which depends on your network bandwidth because file size is around 4.3GB.

Step 2

Make a bootable drive

You can use a DVD or USB pendrive or external hard drive to create a bootable media containing Mac OS X Mountain Lion. Here I am writing steps for USB media but same is applicable for DVD also.  You can't use Lili USB Creator or UNetBootin to create bootable USB containing Mac OS X ML because mac won't boot from the filesystem used by these softwares so you must first format your pendrive in mac os compatible filesystem. To do this there is a software TransMac which comes with a 15 days trail period. Download TransMac from here. After installation of TransMac open it as Administrator, click on File tab and then select "Open Disk Image", now give the path of downloaded iso, img or dmg file. You can see the contents of image file on the right pane. In the left pane your USB drive will be visible, right click on it and select "Format Disk for Mac" as shown in the image.

When formatting completes then again right click on USB drive and then select "Restore with Disk Image", select the path of image file. It will show a message "Formatting will erase all data", select ok to continue. It will take about 20 minutes to finish creating bootable usb disk.

Step 3

Installation on Mac

Insert bootable usb device in you mac. Restart your mac and press alt/option key at the beginning. You can see all bootable media on the screen, select usb device. Next screen will show you four options to choose from. If you want fresh installation then select Disk Utilities and then erase whole disk and create partition then continue.Follow the installation process its quite easy. After installation completes then you can update your system to later version.