回复： Every SD card says write protectedIf it's not a file system issue, it might be a physical issue with the camera. Have you checked inside the card slot to make sure nothing may have gotten in? SD cards rely on a physical write-protect mechanism (the little switch on the side isn't connected to anything electronic: see this image by Saltmiser on Wikipedia), so the protection is usually handled on the device itself. Typically this is done with a little lever or switch to detect the position of the SD card's plastic tab, so check if something inside the reader is causing it to stick or holding it down. Hope this helps!