Where are my files?

Hello,

I have some pictures that I can't seem to find. I scanned the files from my all in one printer to an external hard drive. When I connected the external hard drive back to my computer, there was no folder containing the pictures.

When I connect the external hard drive to the printer, it scans the hard drive has having all the scanned photos through its small touch screen and shows its picture.

I can't seem to get them onto my computer.

Any help would be greatly appreciated, as these are old photos and documents that have been thrown away because I believed they were scanned (dumb move on my part, I know).

Thanks

 

The format is "Mac OS Extended (Case-sensitive, Journaled) and the Sharing & Permissions are enabled for Read & Write. Is that right? (I'm on a MBPr)