Compare folders on 2 drives

[Sunbittern]

I'm using FreeFileSync for the first time today. I browsed to a folder on F: (internal drive) and to the same folder on G: (in a dock connected by USB cable). The folder on F: was copied to G: using Windows File Explorer quite some time before I installed FreeFileSync. All of the files in this folder are image files, mostly scanned photographs.

When I clicked "Compare" in FreeFileSync selecting either "File time and size" or "File size" in settings, no files show up on the right (G:). When I selected "File content" and clicked "Compare" it found 1424 files that exist only on the left side (F:) and 170 files that are not equal.

I navigated to those folders in Windows File Explorer and checked a couple of files manually. It appears that the 170 files that are not equal are corrupt on G:

But I can find and open some of the 1424 files that FreeFileSync says are missing in G:

Any advice would be appreciated.

[Plerry]

By default, the FFS Compare results window only shows files for which sync actions (in any form) are required, and hides files it thinks are equal.
If you click the "="-icon mid below the Compare results, you can toggle the visibility of equal files.