My 10 TB Easystore drive says it has 3.6 TB of data in Disk Utility but finder only shows 25 gigs after reinstalling Mac OS

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I reinstalled 10.14.5 on my MacBook Pro after backing it up to my 10 TB Easystore drive. In Disk Utility it says there is 3.6 of data used, but finder only sees 25 gigs. How do assess the missing files that Disk Utility sees?