![]() How to Boot from an External Device on Restart with Mac Boot Manager ![]() Any Mac running Lion (10.7) or newer will also be able to use the Boot Manager to startup from the Recovery partition. You’ll need a bootable drive of some sort to be able to do this, whether it’s a USB installer drive you made yourself for macOS Mojave, macOS High Sierra, macOS Sierra, Mac OS X El Capitan, Yosemite, for OS X Mavericks or prior versions of Mac OS X, a mirrored external hard drive made through SuperDuper, or even a boot disc. We’ll cover the two easiest ways to do this, during boot with the Mac Boot Manager, and also through System Preferences using the Startup Disk selection tool. ![]() There are plenty of reasons for booting from external volumes, whether it’s to troubleshoot problems, repair disks, partition, format everything, update, or even reinstall Mac OS X. Certain situations require a Mac to be booted from an external boot volume, rather than the primary startup disk.
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