![]() Hdiutil create -o /tmp/CatalinaBase.cdr -size 9000m -layout SPUD -fs HFS J Hdiutil attach /Applications/Install\ macOS\ Catalina.app/Contents/SharedSupport/InstallESD.dmg -noverify -mountpoint /Volumes/Catalina iso – Remove OS X everywhere and replace it with macOS, and then make the second. Thanks for the instructions – I had to make a few adjustments to get the latest 10.15.7 Catalina to shove itself into an. Were you successful in creating an ISO file from a macOS installer? Do you have another approach to make an ISO file for macOS installers? Let us know in the comments below. ![]() Whether or not creating a macOS installer ISO file and using that ISO is easier than simply using a bootable USB flash drive is entirely a matter of use cases, and in some situations an ISO is the only usable format (ie for certain virtualization scenarios). ISO files are flexible and widely used, they can also be burned to create boot disks and to other media, and you can also copy the ISO to a USB drive with dd or perform any other multitude of actions. You can also convert ISO files to VDI VirtualBox images if needed. If you intend on using the ISO file for a virtual machine, you simply need to select the Mojave.iso disk image in the virtual machine app as a boot disk, or mount it within the VM as any other disk image would be. That’s it, now you should have an “Mojave.iso” disk image file on the Mac desktop which is the macOS installer ISO image. Mv ~/Desktop/Mojave.cdr ~/Desktop/Mojave.iso
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