In other words, Catalina protects the OS in its own read-only volume. It’s this separation of the two boot volumes that Apple hopes will help your Mac maintain integrity of the macOS operating system by preventing potentially malicious software from modifying protected files and folders on your computer.Ĭatalina runs in a dedicated, read-only volume - meaning it’s completely separate from all other data and nothing can overwrite your critical operating system files. Data volume: This volume contains everything else, including your home folders such as Documents, Music and Movies.System volume: This read-only volume contains all the operating system files that should never change during use of your computer.In addition, APFS volumes under Catalina can have 16 unique roles, including System and Data. A volume group can have multiple volumes that appear as a single volume to both the system and the user. Why the heck does the macOS Catalina installer need to create a split boot volume? Moreover, how come the user only sees one volume on the desktop? Introducing APFS volume groupsīefore we get to it, it’s important to first get you up to speed with the concept of a new APFS (Apple File System) feature in Catalina, called volume groups. But dig a little deeper and you may realize that it actually splits your boot volume into two distinct components, named Startup and Data. On the surface, the macOS Catalina installer appears to copy the operating system files to the startup disk of your Mac.
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