Computer Geek Question

Been going thru my old XP, Win7, Win10 hard-drives & lots of CDs&DVDs.
Many, many pictures and old notes. Many duplicates through out all of these medias.
Also some in folders, some in the root of the media.

Is there any programs or apps that scan, compare and find & index duplicate files?
I can then organize all and write all to a single archive drive with no dup files.

In the old days, I just copied all an a large disk and did not write over repeated file names.
Still, dup files can be in different folders.
There has to be a smarter way.