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When you’re happy choose Apply and agree to the question that asks if you are happy to erase the Flash drive. Now on the right of this area enter a name for your drive, like “OS X Installer” and change the format to “Mac OS Extended (Journaled). Then click options just below this box and select the GUID partition table option, then click OK. In the partition area first click on the “choose” above the big box (in the “volume scheme” area) and change it to “1 partition”. Make sure you clicked the main entry for the Flash drive. If you do not see the option to partition you did not click the correct drive on the left or clicked the sub heading. Now in the big panel on the right choose partition at the top, it should be the middle tab, between Erase and RAID. The main part that might say something like “28.36 GB NAMEOFCOMPANY”. Not the sub heading of it, the main heading. Make sure you click on the part of it that is most to the left on the left panel. In disk utility, select your OS DOWNLOAD drive on the left panel by clicking on it. Now we will partition the OS DOWNLOAD USB drive and make it bootable. (Hold the CMD key and press space bar -> Type “disk utility” without the quotes -> select disk utility from the list that is shown). Insert the OS DOWNLOAD USB Flash Drive into the Macbook Pro. No extra Mac software is required to make or use the USB boot drive method. I used a separate 8GB USB Flash drive for my OS BOOT DRIVE to keep a permanent solution. This is optional because you can copy the files onto your hard drive and then on to the OS DOWNLOAD USB flash drive again whenever you need it. Optional 8GB or more Flash drive for a permanent USB drive, or you can reuse the OS DOWNLOAD DRIVE. I used a 32GB USB drive, 12GB is the minimum amount of Geebees you need.
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Using a USB drive method without the downloading makes a full reset take 30 minutes. The second reason to make a bootable USB OS drive is it makes reinstalling the operating system faster. The main reason to make the bootable USB drive is to not have to download the 4GB file every time you want to do a reinstall of the Mountain Lion operating system.
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Why Make A Bootable USB Install Drive for Mac Mountain Lion OS? This is the process I used to create a bootable USB drive of Mountain Lion OS X for my Macbook pro. Difficulty rating 2/10, maybe even 1/10, super easy! This process for making a boot drive can work for other Macbook types too.
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My Macbook was the Macbook Pro 13″ inch 2012 model. This is the process I used to make a bootable USB drive of the Mountain Lion Operating System on my Macbook Pro. Make a bootable USB drive Install of Macbook Pro OS Mountain Lion.