The file format is the standard for disk images. For macOS, this format is primarily used for virtualization .
Use Apple’s native deployment tool inside the installer app to write the bootable installation files into the workspace:
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Locate the file named . This package contains the core configuration files needed to build your custom DMG or ISO. Method 2: Create Your Own macOS Catalina ISO Image
This pulls the latest version (10.15.7) directly from Apple’s CDN. The file format is the standard for disk images
Open your Terminal ( Applications > Utilities > Terminal ) and execute the following commands one by one:
When downloading pre-compiled DMG or ISO files from the internet, always take the following precautions: This link or copies made by others cannot be deleted
Apple released macOS Catalina (version 10.15) in 2019, introducing major updates like the retirement of iTunes, the addition of Sidecar, and exclusive support for 64-bit applications. If you need to restore an older Mac, set up a virtual machine, or create a bootable installer, obtaining a clean, official copy of macOS Catalina is essential.
hdiutil attach /tmp/Catalina.dmg -noverify -mountpoint /Volumes/Catalina
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled Use code with caution. Press Enter, input your password, and type Y to confirm.