Sorry if this isn't the right place Mods, I didn't know where to place this. I'm preparing to reformat and I'll be saving my photos to a 1 TB external HDD. How do I go about not saving duplicate pics I already have saved to the HDD since I didn't clear them out on my last reformat? We're talking 10,000 + photos so I can't view them individually. I know there is software to do this but which is best? These are pics like the birth of my son etc, priceless and irreplaceable. Thanks Gang