The DMG image format is by far the most popular file container format used to distribute software on Mac OS X. ![]() First of all, remove an invalid link that won't be needed here. We're going to put some files into this directory. $ asr restore -source /Volumes/esd/BaseSystem.dmg -target /Volumes/iso -noprompt -noverify -erase Validating target.done Validating source.done Retrieving scan information.done Validating sizes.done Restoring.10man.^R.20.30.40.50.60.70.80.90.100 Remounting target volume.done The asr tool will automatically create a new mountpoint, /Volumes/OS X Base System. Mount this image to some directory by using the hdiutil tool. ![]() It's not a bootable ISO that can be used to install the system on a virtual machine, but we'll get there. ![]() There is an installation image file inside /Applications/Install El Capitan.app, named InstallESD.dmg. Start with going to AppStore and installing El Capitan, so you'll have an application named Install El Capitan in your Application list. It's very easy to create a bootable ISO image of El Capitan, if you have a working El Capitan system installed on your machine.
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