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.

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.

Now that Apple has released OS X 10.9 Mavericks, you might want to consider creating a USB install drive for clean installs and future use.

The OS X 10.10 Yosemite installer from the Mac App Store in your Applications folder. The installer will delete itself when you install the operating system, but it can be re-downloaded if necessary.