Insert a blank DVD disc into the Mac's optical drive.Ģ. With the Mountain Lion InstallESD.dmg file copied to the desktop, you're ready to burn the installer bootable DVD.ġ. Burn the bootable DVD of the Lion X Mountain Lion installer When the process is finished, you have a copy of the InstallESD.dmg file that you need to create a bootable copy on the desktop. Pasting an item into the desktop takes some time, so be patient. Right-click an empty area on the desktop and select Paste Item from the pop-up menu. Close the Finder window and return to the desktop.ħ. Right-click the InstallESD.dmg file and select Copy InstallESD.dmg from the pop-up menu.Ħ. You will see a file called InstallESD.dmg.ĥ. Open the Contents folder and then open the SharedSupport folder. Right-click the Install OS X Mountain Lion file and select Show Package Contents from the pop-up menu.Ĥ. Scroll through the list of files and find the file called Install OS X Mountain Lion. Open the Finder window and go to the Applications folder (/ Applications).Ģ. The installation of Mountain Lion that you need to create a bootable DVD or USB drive is contained in the Install OS X Mountain Lion file that you downloaded from the Mac App Store.īecause the image is contained in the downloaded file, copy it to the desktop to create an image that can be booted as easily as possible.ġ. Locate the installation of Mountain Lion image You must create a bootable copy of the installer before you install Mountain Lion, because the setup process will delete the files you need to create a bootable copy of the installer. This file is called Install OS X Mountain Lion. It is saved in the Applications folder on the Mac. You can also use a USB flash drive with at least 5GB capacity (8GB and 16GB are available sizes) as a bootable medium.ĭownload a copy of OS X Mountain Lion that you must purchase at Apple Store online and download it from the Mac App Store. If your Mac doesn't have an integrated SuperDrive, use an external DVD burning tool. DVD dual layer is available wherever standard DVDs are sold. The OS X Mountain Lion installer is just too big a thing to match the standard DVD.

DVD dual layer has two layers, increasing the available recording space to about 8.5GB. You need a dual layer DVD (DVD with double sided recording) and a disc or USB drive. Copy the InstallESD.dmg file to the flash drive.Copy the installer Lion X Mountain Lion to the USB can boot.Burn the bootable DVD of the Lion X Mountain Lion installer.Locate the installation of Mountain Lion image.How to create OS X Mountain Lion installer on DVD or USB

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