The system volume is read-only and locked against modification during an active macOS session the Data volume can be read and written, and apps on its may be launched. With the concept of a volume group in APFS, Catalina organized all system files and core apps into one volume and all user-owned and user-modifiable data, third-party apps, and some Apple apps into another. This culminated in macOS 10.15 Catalina in splitting macOS into two pieces, which appear seamlessly as a single unit in the Finder, but which severed a long-time intermingling of files.
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