![]() If you upgrade to macOS Catalina from an earlier version of macOS, the read-only volume is created during the upgrade process. ![]() The Disk Utility app in macOS Catalina shows that Macintosh HD is the read-only system volume and Macintosh HD - Data contains the the rest of your files and data. In the Finder, both volumes appear as Macintosh HD. Your files and data are stored in another volume named Macintosh HD - Data. This volume is completely separate from all other data to help prevent the accidental overwriting of critical operating system files. MacOS Catalina runs on a dedicated, read-only system volume called Macintosh HD.
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