![]() Select the default startup disk in System Preferences When the following window is displayed, choose whichever item you want to boot to as the default. It’s also possible to set the default startup disk/partition from the Startup Disk option in System Preferences. You can select whichever version of Mac OS that you want to boot to simply by clicking on the appropriate icon. The Mountain Lion recovery partition will be labelled Recovery-10.8. Lion or Snow Leopard if that’s what you already had installed). The second item is obviously Mountain Lion, and the Recovery HD partition is for the first OS in the list (i.e. The first item in the list will be the standard Mac OS installation (e.g. Now that you have two versions of OS X on your Mac, how do you control which version it boots up to? The solution is simple – when your Mac starts, hold down the OPTION key and you’ll be shown a list of the drives and partitions on your computer – they’ll be labelled something like this: Once it’s installed correctly and booted up, you’ll be presented with the normal OS X welcome screen. Your Mac should reboot and Mountain Lion will then be fully installed. Step 4. If all’s gone to plan, you’ll now be able to sit back and watch the installation process. Install the Mountain Lion Developer Preview Step 3. Now just follow the installation process, and when prompted select the new Mountain Lion partition that you just created. Step 2. Launch the OS X Mountain Lion Preview installation file, and open the Install OS X Mountain Lion Preview application to initiate the installation routine. If you’ve already registered with the Mac Developer Program (which costs a fairly reasonable $99 per year), you’ll be able to download Mountain Lion from the Mac Dev Center. At the moment, it’s only possible to obtain the developer preview, but when it’s officially released it will of course be available as a normal download from the App Store. ![]() Before you can actually install Mountain Lion you need to download the OS. Install Mountain Lion On The New Partition (F) When you’ve entered the desired size of the partition, hit Apply Create a new disk partition onto which you'll install Mountain Lion.If you plan to just play around with Mountain Lion and not install too much, you could allocate a small figure such as 20 GB. The amount you choose is entirely up to you, but it’s recommended that you allocate a decent amount of storage considering how much you think you’ll need for storing documents, photos and applications. (E) Choose a decent size for the partition.(D) Name the partition something easily identifiable, such as Mountain Lion.(C) Click on the small Add ( +) icon to create a new partition.(B) Click on the Partition tab in the main window.(A) Select your hard disk in the left hand side panel.Just open Disk Utility from the Applications -> Utilities folder and follows the steps below – each step is labelled correspondingly in the screenshot. This is a relatively easy task using the built-in Disk Utility tool, which can help you to accomplish the task in just minutes. To install Mountain Lion, it’s necessary to create a new disk partition on your Mac. ![]() The list above is based on the developer preview version of Mountain Lion, and so is subject to change before it’s officially released. In general, the newer the Mac the better, but it’s always a good idea to check the Apple website and support to double check whether your computer is compatible. MacBook Pro (17″): models from late 2007.MacBook Pro (15″): models from late 2007.MacBook Pro (13″): models from mid 2009.The Macs which should be able to run Mountain Lion are as follows: The relevant part here is the x86_64 bit I’ve highlighted in bold. Just open the application (which resides within the Applications -> Utilities folder, or just search in Spotlight) and type uname -a at the command prompt. It’s possible to confirm if your Mac can boot into 64-bit mode using Terminal. An Internet connection to download OS X 10.8.The ability to boot into OS X 64-bit mode. ![]()
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