![]() 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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