I have some personal photos on a camera I deleted, but I learned that the photos are actually still present but hidden in the background as free space. So how can I shred this free space? I tried FileShredder but it didn't detect my camera.
Note: my camera is a Nikon Coolpix L11.
With the memory card in I did the "Format Card" option. I took it out, then was met with and used the "Format Memory" option. Do you think these did it?
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Format memory should have done it -- if you still have the camera have a look. To be absolutely sure just shoot some junk shots to refill the onboard memory.