# Create a blank DMG (temporary) hdiutil create -o /tmp/Catalina -size 8500m -layout SPUD -fs HFS+J -type SPARSE hdiutil attach /tmp/Catalina.sparseimage -noverify -mountpoint /Volumes/Catalina Copy installer app to DMG sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction Unmount and convert DMG to ISO/CDR hdiutil detach /Volumes/Install\ macOS\ Catalina hdiutil convert /tmp/Catalina.sparseimage -format UDTO -o /tmp/Catalina.iso Rename (optional) mv /tmp/Catalina.iso.cdr ~/Desktop/macOS_Catalina.iso
Result: A bootable ISO suitable for VMs or optical media (DVD-DL). | Risk | Description | |------|-------------| | Malware | Pre-installed trojans, miners, ransomware | | Modified system files | Could disable security features (SIP, XProtect) | | Missing firmware updates | macOS installers often require firmware – fake ISO may skip | | Apple signature broken | Won’t run on real Macs without disabling security | sistema operativo mac os catalina iso
