Create an OS X El Capitan USB installer without third-party tools

This post updates How to create an OS X Yosemite USB installer

Like I've previously explained, Macs don't come with a bundled Install DVD anymore.

This can cause problems if you have to re-install OS X, as Internet Recovery is very slow, or, at times, doesn't work over Wi-Fi for older Macs.

However, you can create an USB installer through Terminal, without installing any third-party software.

Steps:

1. Format a USB drive, at least 8 GB large, choosing the OS X Journaled file system.
2. Call it MyVolume (you can also name it differently, but if so you'll have to change the following command accordingly):
3. That done, launch the following command from Terminal:   

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --nointeraction --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app

All the system files will be copied to the drive and this will require a while.

The command will hang until the operation is completed, so grab a tall coffee mug, or go for a walk until it's done.

That's what it looks like when the installer is ready to go.

At this point, you can boot from your installer and re-install OS X.

Be advised your USB installer might occasionally not show up in Startup Disk.

However, it'll surely be shown when pressing ALT at boot-up.