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sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction

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: Ensure you have at least 12.5 GB of free space for the installer and another 9 GB for the temporary disk image during the ISO creation process. sudo /Applications/Install\ macOS\ Catalina

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: Use the createinstallmedia tool included in the Apple installer: sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction

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