I have Mac OS X Mountain Lion as Application Bundle file. Burning the application to a disk is just like a data disk compilation on Nero.

How do I convert this application bundle into ISO image so that I can burn it on a disk and boot it from there?

  • What exactly are you after - booting of a CD requires the full OS, allowing to run the application of a CD is much simpler
    – mmmmmm
    Feb 9, 2013 at 13:50

2 Answers 2


Right-click your "Install OS X Mountain Lion.app" file and select "Show Package Contents". Open Contents/SharedSupport and then you will find InstallESD.dmg.

Copy this file to your Desktop. This is the file that you need to burn OS X to a DVD. You need a Dual Layer DVD to burn OS X/or just use a USB flash drive.

It isn't an ISO, but you can convert to a 'cdr' from Disk Utility. A 'cdr' file is the same as an 'iso' AFAIK, and you can rename the extension so that it is an ISO.

sudo gem install iesd
iesd -i /Applications/Install\ OS\ X\ El\ Capitan.app  -o Desktop/Capitan.iso -t BaseSystem
  • Welcome to Ask Different and thank you for your answer. :) Unfortunately, short answers such as this don't really provide enough detail or context to help many users. If possible, it'd be good if you could add some more info, such as how a user would go about using your answer, etc. Also, you may want to read How to Answer for tips on providing answers here.
    – Monomeeth
    May 17, 2018 at 2:47

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .