[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. 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.
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September 2018
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