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When you do this you should see the disk image appear in the Source field, but if not then drag it there.

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Optionally partition it by selecting it and using the Partition tab to split it into two logical volumes (one for the Mountain Lion installer and the other for extra storage space) by clicking the plus button to create a new partition, and then setting the first partition to be 4.8GB in size.ĭrag the destination drive to the Destination field, and drag the InstallESD.dmg image to the Source field.

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If you wish to create a USB or FireWire install drive instead, then continue on to step 6.
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Right-click the "Install Mac OS X Mountain Lion" application in the Applications folder, and choose "Show package contents.".In this case, you can go to the Purchases section of the App Store and redownload the installer. If you have already installed Mountain Lion, the installer will have been automatically deleted from your system. Locate and right-click the Mountain Lion installer to show its contents (click for larger view).

Quit the installer (press Command-Q) and go to the Application folder on your system.
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We previously outlined how to create your own OS X install drive when OS X Lion was released, and the process for Mountain Lion is for the most part the same. Additionally, while Apple's OS should be available using Apple's various Internet recovery options, this can often take a long time to download, especially if you do not have the fastest broadband connections available to you. As with OS X Lion, Apple will likely release USB drives containing a bootable Mountain Lion installer, but this will cost you more than the App Store download. You also might be interested in creating a standalone install drive for Mountain Lion. If you're interested in the new OS, then be sure to read our guide on preparing your Mac for installing the upgrade, which includes information on the OS requirements, backing up, and clearing up resolvable issues before performing the upgrade.
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If you're a macOS Mountain Lion user, you should know that an update that improves the previous version is now available. This is why it is advisable to update it, as you will find new features have been added and errors corrected regarding the out-of-date version. Time goes by for everyone, and that includes your Mac's operating system.
