Mac OS X – Install Yosemite/El Capitan via USB Thumb Drive or How to Get the DMG Image

Howdy folks, this is just another somewhat plagiaristic post for my own future reference. I found this info hyah and unfortunately I was unable to retrace my steps to find my original source on where to locate the .dmg file in the installer package.

Download the latest version of Yosemite/El Capitan from the App Store and make sure you’ve formatted your USB thumb drive with the Disk Utility. Then open up a terminal and issue the following commands:

sudo /Applications/Install\ OS\ X\ --volume /Volumes/YourThumbDriveHere --applicationpath /Applications/Install\ OS\ X\ --nointeraction

El Capitan

sudo /Applications/Install\ OS\ X\ El\ --volume /Volumes/YourThumbDriveHere --applicationpath /Applications/Install\ OS\ X\ El\ --nointeraction

To locate the disk image or DMG file directly from the installer package:

  1. Open up Finder > Applications
  2. Right-click the Install OS X Yosemite/El Capitan package and select “Show Package Contents”
  3. Navigate to the Contents > SharedSupport folder
  4. Find the disk image “InstallESD.dmg”

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