How to create macOS bootable ISO. Convert dmg to iso (Easy step by step guide)
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.
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Commands to create the ISO file:
***Remark for Big Sur***
Replace Catalina with bigsur
The size on the 1st command should be 16384m
The 3rd command will be: sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/bigsur --nointeraction
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
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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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