I have a large harddrive which I save copies of my video and audio files to, for video and audio editing. But I can longer save anything to it. If I do, it says that it's not an option to save to this location. I cannot figure out what the problem is with the harddrive. It seems to work fine that all files that have been saved on there before are fine and will play. But I cannot save anything else to it. There is still 2 thirds of room left on it as well, so it's not too full. What can I do, if anyone knows?