How to Make a Bootable Flash Installer of OS X or macOS – by Tom Nelson

How to Make a Bootable Flash installer of OS X or macOS – by Tom Nelson – on Lifewire (Updated October 4, 2017)

The process of installing OS X or macOS on a Mac hasn’t changed a great deal since OS X Lion changed the delivery of the OS from optical disks to electronic downloads, using the Mac App Store.

The big advantage to downloading the Mac OS is, of course, immediate gratification (and not having to pay shipping charges). But the downside is that the installer you download is deleted as soon as you make use of it by installing the Mac operating system.

With the installer gone, you lose the opportunity to install the OS on more than one Mac without having to go through the download process again. You also lose out on having an installer that you can use to perform clean installs that completely overwrite your startup drive, or having an emergency bootable installer that includes a few useful utilities that can bail you out of an emergency.

To overcome these limitations of the installer for OS X or macOS, all you need is a USB drive that contains a bootable copy of the installer.

How to Make a Bootable Flash installer of OS X or macOS – by Tom Nelson – on Lifewire (Updated October 4, 2017)