Hi Gary, check the tiny slide switch on the side of the sd-card. If it's set the wrong way, it prevents any device from writing to the card. It's easy to move this accidentally, especially when inserting it. Update: btw it's in the manual - page 96, but Tascam in their wisdom have filed it under 'Protected Card' and not 'Card Protected', so don't blame you for missing it It kind of defeats the point of the error messages being in alphabetical order! Let us know if this was the cause, or if it was something else.