I have the same problem with my Sony CD Mavica 3.3 megapixel (MVC CD300) where I was taking pictures recently and one cd is telling me "Disk protect." I cannot finalise, format, or initialise the disk. Other disks work fine. There are also other photos that I know I have taken on the disk, but I cannot view or finalise them as "disk protect" comes up on the camera and my PC won't show the extra files. Does this mean the disk is full, and does anyone know how to unprotect the files I have not finalised?