macOS Catalina runs on a dedicated, read-only system volume called Macintosh HD. This volume is completely separate from all other data to help prevent the accidental overwriting of critical operating system files. Your files and data are stored in another volume named Macintosh HD - Data. In the Finder, both volumes appear as Macintosh HD.
How to Run 32-Bit Apps in macOS Catalina Apple's latest version of macOS, Catalina, officially ditches 32-bit app support, but you can still run the software you need by following these steps. Apple’s latest Mac update, macOS Catalina, was released earlier this week, and with it came a flurry of complications both minor and major. For one, this update is the first for Apple to drop 32. Safari uses these links to find the old installers in the App Store. After being downloaded from the App Store, the installer opens automatically. MacOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite or Mavericks macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks or Mountain Lion.
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.
If you upgrade to macOS Catalina from an earlier version of macOS, the read-only volume is created during the upgrade process. Files or data that you previously stored in the startup volume are now stored in this new volume, and some of these files may appear in a new folder called Relocated Items. You can check this folder for any files that you can’t locate.
With macOS Catalina, you can no longer store files or data in the read-only system volume, nor can you write to the 'root' directory ( / ) from the command line, such as with Terminal.
About the Relocated Items folder
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While creating the two separate volumes during the upgrade process, files and data that couldn’t be moved to their new location are placed in a Relocated Items folder. The Relocated Items folder is in the Shared folder within the User folder (/Users/Shared/Relocated Items) and available though a shortcut on the Desktop. The Relocated Items folder includes a PDF document with more details about these files.