I found a easier solution. Just open the battery/memory stick door (my model is DSC-F828) and with the memory stick out (I am not sure if if important, my stick was out at the time I performed the folloowing procedure) with a sharp pin, press the "reset" botton next to the memory stick. Is it! My inmediatly got my memory stick bak operational and normal, all the pictures were intact, was no need to format anything, nothing lost. Good luck

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