With Mac OS X Lion and a new piece of free software, it’s easier than ever to create a USB keychain that you can boot from.

How-To How to create a bootable USB macOS installer Make a macOS installer with createinstallmedia and install Sequoia, the latest beta, or any macOS on multiple Macs, or do a clean install.

Though you can install Mavericks (OS X 10.9) directly from your Mac's hard drive, a bootable installer drive can be more convenient for installing the OS onto multiple Macs. And if your Mac is ...

We’ve already covered how to do this from the command line (See How to create a bootable USB to install OS X), but I wanted to give those with a fear of the command line a way to do the same thing.