While the support article covers the basics, the tool gained a new feature in Mojave which is not documented in the article. Also, while it not a good general configuration, it can be very useful to enable external boot on machines that you frequently re-install for testing. Nevertheless, having an bootable external installer is still every useful for ‘legacy’ (i.e. But it is expected that any new Macs released from now on (as in maybe at the Apple Event tomorrow?) will also have Secure Boot. As of this writing this affects the iMac Pro and the 2018 MacBook Pro. Note: Secure Boot Macs with the T2 chip cannot boot from external drives in the default configuration. When run, the tool requires a path to an external volume or partition, which will be erased and replaced with a bootable installer volume. The tool is called createinstallmedia and can be found in /Applications/Install macOS Sierra | Mojave].app/Contents/Resources/. Apple actually has documentation for this tool. Apple has included a tool to build a bootable external installer drive with the macOS Installer application for a while now.
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