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Get up to date with the latest version of OS X Snow Leopard or Lion to purchase OS X Mountain Lion from the Mac App Store.

Make sure you have the latest version of Snow Leopard or Lion.

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So, if your Mac already has Snow Leopard installed but its version is 10.6.7 or earlier (check by choosing Apple Menu→About This Mac), be sure to update it to the latest version In order to purchase Mountain Lion from the Mac App Store, you must be running the latest version of Snow Leopard or Lion. I recommend starting with at least 20 GB of free space (before downloading the installer). But my experience suggests that in real-world use, 8 GB is cutting it too close for comfort.

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And, in fact, a full install of Mountain Lion can, under optimal conditions, fit in less than 6 GB of disk space. Īpple says Mountain Lion requires 8 GB of free disk space-presumably not including the 4 GB or so you’ll need for the installer itself. To see if a firmware update is available, check this Web page. Some computers may require updated EFI or SMC firmware to run Mountain Lion. Even though 2 GB is the official minimum, I strongly suggest having more, if your budget allows. If your Mac is not on that list (or has an older model number), then regardless of its age or speed, I’m very sorry to say that it won’t run Mountain Lion.ĢGB physical RAM. Here are the Macs that can run Mountain Lion: (Keep in mind that the comma should be interpreted as a decimal point, so 5,6 is newer than 5,5, and 6,1 is newer than 5,6.) Once you know your Mac’s Model Identifier, you can look it up in the list below. It consists of your Mac model name followed by a pair of numbers, without spaces - as in “iMac11,3” or “MacBookPro5,5.” In the list on the left, make sure Hardware is selected, and look for the line that says Model Identifier.

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To find out if your current Mac has one of these processors open System Information (in Lion) or System Profiler in Snow Leopard (or earlier Mac OS X versions) it’s found in /Applications/Utilities. Your Mac must have an Intel Core 2 Duo or better, a logic board designed to boot into a 64-bit kernel as well as an “advanced GPU (graphics processing unit) chipset.” to run Mountain Lion.

Make sure your Mac can run Mountain Lion.

Click on Continue, select the destination drive, and install.Q: What are the minimum requirements for OS X 10.8 Mountain Lion?Ī: Listed below are some minimum requirements for upgrading to OS X 10.8 Mountain Lion. Select the orange “Mac OS X” option and you will boot into the OS X Mountain Lion installer, from here installation is the same as normal. When finished, reboot the Mac and hold down the Option key to bring up the boot menu:

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Confirm that the USB drive will lose it’s data and enter the Admin password when askedĭisk Utility will now create a bootable OS X Mountain Lion installer drive out of USB drive using the disk image, this can take a little while depending on how fast the drive and Mac are but 20-30 minutes isn’t unusual.Drag the formatted partition to the “Destination” section, then click on “Restore”.Drag the previously mounted “Mac OS X Install ESD” image into the “Source” section.

Now select the formatted USB drive from the left side and click on the “Restore” tab.Select the USB drive from the left menu and click on “Erase” tab, choose “Mac OS X Extended (Journaled)” as the format, then click on the “Erase” button in the corner.

Launch Disk utility and connect a USB drive to the Mac.

Make the OS X Mountain Lion Install Drive

Double-click on InstallESD.dmg to mount it on the desktop.

Open the “Contents” directory and then open “SharedSupport”, looking for a file named “InstallESD.dmg”.

Go to the /Applications/ directory and right-click on “Install Mac OS X Mountain Lion.app” selecting “Show Package Contents”.

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Download OS X 10.8 Mountain Lion from the App Store.

Download OS X Mountain Lion and Extract the DMG File If you already have the Mac OS X Mountain Lion install DMG extracted, skip this first set of steps and jump directly to making the bootable drive below. We’ll walk through the process here, but don’t forget to check OS X 10.8 system requirements for the destination Mac before beginning. By creating a bootable install drive, you can perform clean OS X 10.8 installs, install it on separate partitions, and install OS X Mountain Lion on Macs that don’t have internet connections.