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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