I can answer my question for myself.
Just checkt the output. Photorec recovers plenty readable foots.
Photorec seems to be way better to recover images than testdisk.
Thanks for your support. This thread can be closed.
thanks for your response. It can't be fat16, it is fat32, you are absolutely right on this.
I am running Photorec now. Lets see what happens, this will take some time.
I have a problem here. My Girlfried has a external 1TB (fat16) HDD to store her precious photos. 2 weeks ago she deleteted them all by mistake. Well done I said, now its up to me to undo her mistake :/
Initial situation: The harddisk is almost empty, all photos (lots of GBs) are ...