This error seems to be happening with every piece of media I have in the device (I have 12 tapes in right now, and half of them are brand new out of the box). In the error there is a place for the media identifier, but it is blank... so I suspect it is something else, but this weekend I will pull out all the media except one tape, and see if I can repro the error, then I will erase the media and see if it happens again.