When the “Install MacOS Mojave.app” or “Install MacOS Catalina.app” application is fully downloaded and within the /Applications folder, proceed. First, download MacOS Mojave installer, or the MacOS Catalina installer (or the installer you wish to turn into an ISO) from the Mac App Store. This process will take an installer for macOS and create an ISO file from it which can be booted or used as a typical disk image file. How to Create a MacOS Mojave ISO or Catalina ISO File from an Installer You can use the same steps to create an ISO file from practically any other MacOS Installer with createinstallmedia present however, including building a MacOS Catalina ISO, or for Big Sur, High Sierra, and Sierra, simply by replacing the file names where appropriate. In this particular walkthrough, we’ll be converting a MacOS Mojave installer application into an ISO file. Space Used: 02:01:35 blocks: 9110 / 18.66MB / 17.79MiBĪny ideas what is occurring here? Thanks a ton.This tutorial will walk through the steps to create an ISO file of a MacOS installer. I tried your approach just from the command line with:ĭiskName=$(drutil status | grep "Name:" | awk ' If anyone knows how to determine the disk number in the script to get around this caveat, then I think we have a complete solution. Personally, I mount all my drives first, then pop the CD/DVD in and I know it will always be disk4 (on my system). The only caveat is that you must have the same drives mounted when you run the script as you did when you issued the drutil status command, otherwise the disk number of the CD/DVD drive will be different and the whole thing won't work for you. When you run the script, you will see your CD/DVD unmount then you will know the process is finished as the CD/DVD will be remounted again. Save the script somewhere and voila, you have a green button method of creating iso's and you only had to type the shell commands once. You'll probably see an example command "cat" in there already, delete this and type:ħ. 
On the left hand side you will see all the applications you have on your system that can be scripted - select Automator from here and then drag "Run Shell Script" to the right hand pane.Ħ. Therefore when I run drutil status i get /dev/disk4 as the name of the current CD/DVD.ĥ. On my system, I have one internal HD and 3 external HD's. Make a note of the Name (something like /dev/disk1) - the drive number changes according to what disks you have mounted at the time you issue the command. Open Terminal and run the command: drutil statusģ. If you are using Tiger, you can very easily create a shell script in automator to have a 'green button' version of tgage's solution.Ģ.
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