On a Mac with the El Capitan installer app:

mv ~/Desktop/ElCapitan10.11.1.cdr ~/Desktop/ElCapitan10.11.1.iso Check that the ISO is bootable by mounting it:

Open Terminal and run:

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction Then, create an ISO from the USB:

hdiutil convert /Volumes/OS\ X\ Install\ ESD/BaseSystem.dmg -format UDTO -o ~/Desktop/ElCapitan10.11.1.cdr Rename the .cdr file to .iso :

sudo dd if=/dev/rdiskN of=~/Desktop/ElCapitan10.11.1.iso bs=1m (Replace rdiskN with your USB’s raw disk identifier – use diskutil list to find it.)

Work: Macosxelcapitan10111imageiso

On a Mac with the El Capitan installer app:

mv ~/Desktop/ElCapitan10.11.1.cdr ~/Desktop/ElCapitan10.11.1.iso Check that the ISO is bootable by mounting it: macosxelcapitan10111imageiso work

Open Terminal and run:

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction Then, create an ISO from the USB: On a Mac with the El Capitan installer

hdiutil convert /Volumes/OS\ X\ Install\ ESD/BaseSystem.dmg -format UDTO -o ~/Desktop/ElCapitan10.11.1.cdr Rename the .cdr file to .iso : macosxelcapitan10111imageiso work

sudo dd if=/dev/rdiskN of=~/Desktop/ElCapitan10.11.1.iso bs=1m (Replace rdiskN with your USB’s raw disk identifier – use diskutil list to find it.)