How to create macOS bootable ISO. Convert dmg to iso step by step

Easy steps to create macOS Catalina ISO image by converting dmg to iso to install on a virtual machine or for other uses.

Applies also to other macOS versions.

Commands to create the ISO file:

hdiutil create -o /tmp/Catalina -size 8900m -volname Catalina -layout SPUD -fs HFS+J
hdiutil attach /tmp/Catalina.dmg -noverify -mountpoint /Volumes/Catalina sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia –volume /Volumes/Catalina –nointeraction
hdiutil detach /volumes/Install\ macOS\ Catalina
hdiutil convert /tmp/Catalina.dmg -format UDTO -o ~/Desktop/Catalina.cdr
mv ~/Desktop/Catalina.cdr ~/Desktop/Catalina.iso

Disclaimer: Use the instructions in this video at your own risk. We are not responsible for any data loss or other damages that may occur

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