How to make your own bootable OS X 10.10 Yosemite USB install driveEnlarge / Even in the download-only era, it's easy to make yourself offline OS X install media. It was 2009 when Apple last released a new operating system on physical media. Things have proceeded remarkably smoothly since version 10.7 switched to download-only installers, but there are still good reasons to want an old, reliable USB stick. For instance, if you find yourself doing multiple install
