I wonder if anyone could give me the best solution for this problem. I am now a complete Apple convert: 27' iMac, macbook, Ipad, iphone. I only use PC at work because I have to. Now I am into photography and I have well over 100,000 photos stored. The problem is that I have some of the older photos scattered on 3 or 4 external portable hard drives from my PC days. When I plug these into my imac, they all appear to me makign noise, but iMac never recognizes any of them, and I am plugging them directly into the back of iMac (it is a mid 2010 model). I even try to use power adopter with some to give them more juice, but iMac just does not recognize them. My goal is to take photos from all of them, and to move them to a single external hard drive that my iMac will recognize so I can have them stored and ready for editing. How do I go about it, what is the easiest solution. I thought first about buying another large external hard drive, formating it for PC and using my wife's laptop (she has HP) to move all files to that one external. But then if I try to reformat the new drive for iMac everything will be lost, so I am not sure what else to do.