[Editor's note: This article is part of our.] 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. 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). For example, if you want to on multiple Macs, a bootable install drive can be more convenient than downloading or copying the entire Mountain Lion installer to each computer. Also, if your Mac is experiencing problems, a bootable install drive makes a handy emergency disk. (Mountain Lion’s 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.

Nov 29, 2017 - Then you can move your space hoggers onto an external drive or a cloud storage. Download CleanMyMac for OS 10.4 - 10.8 (free version).

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Also, if you need to reinstall Mountain Lion, recovery mode requires you to download the entire 4GB+ installer again.) Finally, if you need to —assuming you have the license to do so—a bootable install drive makes it easier to do so. Thankfully, it’s easy to create a bootable install drive from the Mountain Lion installer that you download from the Mac App Store. I show you how, below. You may have noticed that I didn’t mention making a bootable install DVD. Though it’s possible to make one, I don’t recommend it these days. 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. 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.

That said, if, for whatever reason, you absolutely need to create a bootable install DVD, follow steps 1 through 5 under “,” below, but from Step 6 on, follow the instructions under “To create a bootable DVD” in. (Note: As explained in, 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. 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. 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.) Get the latest version of the Mountain Lion installer Before you make a bootable install drive, you should make sure you have the latest version of the Mountain Lion installer. You didn’t even realize there are different versions of the installer? It turns out that when you download the Mountain Lion installer from the Mac App Store, that copy of the installer installs whatever version of OS X was available at the time of download. For example, if you downloaded OS X 10.8 the day Mountain Lion is released, you downloaded the 10.8.

Which means that a bootable install drive you create from that installer will install OS X 10.8.0. Top internet filters. However, unlike with the CD- and DVD-based Mac OS X installers of old, which can never be updated once they’re created, Apple regularly updates the Mountain Lion installer on the Mac App Store so that it installs the latest version of OS X 10.8. For example, when the inevitable 10.8.1 update is released, a few days later the Mac App Store will begin providing an updated Mountain Lion installer that installs 10.8.1 right off the bat.