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hidden files on my scandisk

I use 2GB scandisks in my camera and in my electronic photo albums.  When I import all the photos from these disks (on my Mac Notebook) and send those photos to the trash, they appear clean to both the computer and the camera.  However, they show that they are still mostly full.  When I put them in the photo frames, every photo that has ever been store on that disk plays.  I cannot find these hidden files.  How can I find and delete them?