Get the latest version of the Mountain Lion installerīefore you make a bootable install drive, you should make sure you have the latest version of the Mountain Lion installer. If you don’t, you’ll have to re-download the installer from the Mac App Store before you can create a bootable install drive.) So if you plan to use that installer on other Macs, or-in this case-to create a bootable drive, be sure to copy the installer to another drive, or at least move it out of the Applications folder, before you install. (Note: As explained in our main Mountain Lion-installation article, if you leave the Mountain Lion installer in its default location in the Applications folder when you install OS X 10.8, the installer will be deleted automatically after the installation finishes. That said, if, for whatever reason, you absolutely need to create a bootable install DVD, follow steps 1 through 5 under “ Using Disk Utility,” below, but from Step 6 on, follow the instructions under “To create a bootable DVD” in our article on making a bootable Lion-install drive.
In addition, you can easily update a USB stick or external hard drive each time an update to Mac OS X is released, as explained below with a DVD, you have to toss the disc in the trash and start over, which is both a hassle and bad for the environment. More and more Macs ship without a built-in optical drive booting and installing from a DVD is very slow and 8GB flash drives can be found for $10 or less-there’s little reason to opt for a DVD anymore. Though it’s possible to make one, I don’t recommend it these days. You may have noticed that I didn’t mention making a bootable install DVD. Thankfully, it’s easy to create a bootable install drive from the Mountain Lion installer that you download from the Mac App Store. Also, if you need to reinstall Mountain Lion, recovery mode requires you to download the entire 4GB+ installer again.) Finally, if you need to install Mountain Lion over Leopard-assuming you have the license to do so-a bootable install drive makes it easier to do so.
(Mountain Lion’s OS X Recovery feature, known as Lion Recovery prior to Mountain Lion’s release, is a big help here, but not all Macs get it-and if your Mac’s drive is itself having trouble, recovery mode may not even be available. Also, if your Mac is experiencing problems, a bootable install drive makes a handy emergency disk. But there are a good number of reasons you might want a bootable Mountain Lion installer on an external hard drive or a thumb drive (USB stick).įor example, if you want to install Mountain Lion on multiple Macs, a bootable install drive can be more convenient than downloading or copying the entire Mountain Lion installer to each computer. Like Lion (OS X 10.7) before it, Mountain Lion (OS X 10.8) doesn’t ship on a disc-it’s available only as an installer app downloadable from the Mac App Store, and that installer doesn’t require a bootable installation disc.
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