![]() You’ll see a disk image called “InstallESD.dmg.” This is your ticket to creating a bootable copy of Mountain Lion. In Finder, right click on the Mountain Lion installer and click “Show Package Contents.” Navigate to Contents > SharedSupport. ![]() If you’d rather make a bootable copy yourself, then Apple’s Disk Utility is about to be your best friend. Obviously, writing to a disk is going to take longer than creating a bootable flash drive or SD card. The whole process should take no more than an hour on even the slowest of Macs. This simple, free app walks you through creating a bootable disk/drive of Mountain Lion. $20 Mountain Lion installer app from the Mac App StoreĪs we already told you, the Lion Disk Maker app has been updated with Mountain Lion support.blank 8GB+ USB/external drive or blank 4.7GB DVD disk.Use the copy you make to create a bootable disk or follow this process before you install Mountain Lion on the Mac you’re currently using. The good news is that creating a bootable disk or USB drive of Mountain Lion is pretty simple.īefore you begin: You’ll need to make a backup of your Mountain Lion installer before trying to create a bootable copy. Apple’s installer will keep your files and personal setup intact while installing Mountain Lion, but a bootable disk will allow you to erase your Mac and start completely anew. Another reason to create a bootable copy of Mountain Lion is if you want to do a clean install. When your Mac reboots running Mountain Lion, the installer will be gone and you’ll have to re-download it if you want to use it again. See, the Mountain Lion installer is set to self-destruct once it’s used. Technically, the Mountain Lion installer can be used on an infinite number of Macs once you have it you just need to make a bootable disk or drive. The installer weighs in at a hefty 4.05GB, but the good news is that you can install your copy of Mountain Lion on all of your Macs for no extra charge. Apple only sells OS X Mountain Lion as a digital download in the Mac App Store.
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