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The installer is called Install OS X El Capitan and is by default located in the /Applications directory. The format should be Mac OS Extended Journaled. I’ll use mavinstall for the purposes of this article. To make a bootable USB/flash drive of El Capitan like the one that used to come with the MacBook Air, first name the USB drive. Such a little USB drive would be similar to the sticks that came with the older MacBook Air, when we were all still sitting around wondering how you would ever install the OS on a computer with no optical media or Ethernet otherwise.

Rather than copy the installer to a local drive you can run it right off a USB disk (or Thunderbolt if you dare). A bootable installer is one of the fastest ways to install El Capitan.