Read the boards again. I had the problem when I formatted the MS stick in a multi-reader using my computer. Camera would not read the stick. I came to these boards and found something that fixed my problem. Take stick out, use an eraser to clean gold contact, blow off any eraser residue. Insert the stick, turn camera to set up mode. Find format and format the memory stick in the camera...worked for me. When I had this disk error on my Floppy Drive Mavia, I came and found the solution: Hit it at the bottom with the heel of one hand. Camera read floppies. We have one at work; I tried the hitting with the heel of the hand and it worked for that Sony too. Sometimes you have to hit it, put the disk back in and repeat the process until it reads.