I have a Sony DSC-P72, I have 3 memory sticks, 2 are working fine, the 3rd stick gave me trouble in the camera (I kept getting error codes)after approx. 70 pictures. I inserted the memory stick into a Memorex reader and it does not see it, therefore I cannot unload the photos. I have been using the stick for about 1 year, this is the first time I have been unable to unload the photos onto PC. Any help or ideas would be greatly appreciated. Thank you.