2

This:

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And this:

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Should I be concerned? Should I remove one?

1
  • No - the system is on a separate, read-only volume.
    – red_menace
    Mar 12 '20 at 0:57
3

No, this is perfectly normal for Catalina; it is for security reasons. Macintosh HD has the OS. It is a read-only volume separate from other files on your Mac. Your personal files and data are stored in the Macintosh HD - Data. See this Apple support page for more details.

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