Mountain Lion on a USB

Ok, so to get Mountain Lion onto a USB use the same method as on Lion

First of all, you will need the following

1. Install OS X Mountain Lion.app (4.37GB download from the Mac App Store)

2. 8GB USB Key

Once you have these you will need to get the Mountain Lion Disk Image, which is obtained by clicking on Finder and pressing SHIFT CMD G at the same time and entering

/Applications/Install OS X Mountain Lion/Contents/SharedSupport/

and then clicking the Go button

Once the folder opens then you need to click on the InstallESD.dmg and press CMD C to copy it, then click on your Desktop and press CMD V to paste it

Once it’s copied to your dekstop rename it 10.8.dmg

Double click on the 10.8.dmg to mount it

Next, insert your USB Key and erase it using Disk Utility as follows

1. click on the device in Disk Utility

2. click on the Erase tab in the middle of the main window

3. choose Mac OS Extended (Journaled) from the format dropdown menu

4. name it Mountain

5. then click the Erase button

6. now click on the Restore tab

7. drag the Mac OS X Install ESD volume onto the Source field

8. drag the Mountain volume onto the Destination field and click on the Restore button

you may be prompted for your admin username and password, so enter this, then the task will start and should take around 15-20 minutes (depending on the speed of your USB2 key)

For a video taking you through the installation process once you have created your USB then click on the link below

Mountain Lion – Reformat & Clean Installation

Unhide the Library folder in Lion

By default, the Library folder in your user account is hidden in Lion
To switch this you need to enter the following in a Terminal window

chflags nohidden ~/Library

now reopen a Finder window, click on your home folder and you will see the newly restored Library folder

A video highlighting this can be viewed here 

Create a bootable Lion USB key

To make a bootable Lion USB key, you will need the following

1. A USB Key, minimum 8GB, I use these
2. The Install Mac OS X Lion App

Ok, so first, you need to start up your Mac

Now plug the USB key into your Mac

Next you will need to open Disk Utility, this is located in /Applications/Utilities

Format the USB Key so that it is Mac OS X Journaled and make sure you choose the ‘GUID Partition Table’ option, otherwise you will not be able to boot a Mac from it.

Then you need to locate ‘Install Mac OS X Lion.app’ which should be in /Applications

If you have deleted it since installing then you can redownload it by opening the App Store, then hold down ALT and click on Purchases, this will enable you to redownload it by clicking Install

Click on the ‘Install Mac OS X Lion.app’ to run it, click on ‘Continue’ then Agree to the license and you will be shown your main hard disk, under that there is an option to ‘Show All Disks’ click on that and choose your USB key, click on ‘Install’ and the process will begin, you will then have to restart the machine so the installation can complete, this usually takes around 40 minutes

After this has finished you will be able to boot from your USB key into a full Mac OS Environment, and providing you keep this OS fully updated then you should be able to use it to boot up any Mac.

Once it is fully patched, you can install any additional tools that you use for troubleshooting machines.