I'd mount it as a second storage location in Steam, then, within Steam, use the storage option to move the files over to the main library. That will ensure that they all get moved properly and reduce any potential issues.
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Copy the game folders into ~/.steam/steam/steamapps/common/ and then find each game in your library and install it. It will find the files and skip most/all of the download.
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Did you set the drives game path as a valid install folder in steam, and then move the files into the steamlibrary folder that got created?
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You can boot to the 500GB drive, do a game backup in Steam, then boot into the 2TB drive and import the backup you made.
If you want even easier. You can always re-download them in Steam.
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