A friend of mine was overseas during the holidays and claims that after he downloaded photos to an iMac from his camera, his PC can no longer read the chip. I don't see how that would affect the chip, unless he reformatted it using the iMac...which I don't think he did. I told him to let me rescue the 255 .jpg photos to a Zip disk that was PC formatted, using my Titanium which needs only a small extension to "see" the chip in the reader, and then he could reformat the whole chip using the camera. I hope this was the right avenue/advice. I'm still information gathering. I'd hate to see him lose 255 holiday photos of his family in Poland, where I had no idea they had Macs in such abundance!