![]() ![]() You are selecting your Mac’s hard disk drive (and not your flash drive’s) on the left menu.Select Disk Utility.Īt the Disk Utility screen, make sure you have these selected: You’ll be taken to the OS X Utilities dialogue. Next up, we’ll attempt to remove everything from the current OS and reinstall a new copy of Mountain Lion.įirst, a reboot! Hold down the Option key as you restart and you’ll end up at the screen below. So we’ve downloaded a new copy of Mountain Lion and made it bootable in a flash drive. Once it’s done you’ll have yourself a flash drive with a bootable Mountain Lion. Click the Restore button. Installation may take about 10 – 20 minutes.Drag “Mac OS X Install ESD” on the left menu to Source.Drag the formatted drive from the left menu to the Destination field.Next, we are going to create a bootable OS X Mountain Lion in the flash drive. Once the flash drive is formatted, re-select the formatted USB drive from the left menu, and click the Restore tab. Keep a backup of the files within if you still need them, then come back to this section. Note: This will remove everything in the flash drive. Select Mac OS Extended (Journaled) for the format.In Disk Utility, do the following 4 steps carefully: You can do it quickly by searching via Spotlight. Plug in the flash drive into your Mac and launch the Disk Utility application. Navigate to Contents > SharedSupport, then look for the filename “InstallESD.dmg”ĭouble-click InstallESD.dmg to open/mount it on your Desktop. ![]() Look for the file called “Install OS X Mountain Lion”, right-click and select Show Package Contents. Once your download is done, go to Finder > Applications. Our goal is here to keep a soft copy of the installer and in the flash drive. Create Bootable OS X Mountain Lionĭo not start the installation process when your download finishes. When you get back, we will look at how you can create a bootable copy of OS X Mountain Lion on your USB drive. Make sure that you won’t need any of the contents of the flash drive, if you do, keep a backup of it somewhere first. While you wait, get a coffee, a break and a USB drive with at least 8 GB capacity. Note that this may take up between 10 and 60 minutes, depending on your Internet connection speeds. If you’ve previously purchased a copy of Mountain Lion, don’t worry, you will not be recharged. ![]() Re-enter your App Store credentials if required. Look for OS X Mountain Lion, hold down the Option key and click Download. Launch App Store, and go to the Purchases tab. Here’s how you can download and obtain a soft copy of Mountain Lion. The installer you downloaded fro the App Store automatically deletes itself after you’ve successfully upgraded your Mac. Re-Download Mountain Lionįirst, grab hold of a copy of the Mountain Lion installer file. Recommended Reading: How to Clean Install OS X Mavericks 1.
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