Kurt: I don't know what caused your problem. For future reference, it would have been ok to try another card; pulling out a bad card does not make the Book Port do anything to subsequent cards. If your batteries went dead while reading, this could have messed up the card. Rob Meredith >>> blsmass@xxxxxxxx 04/08/05 11:54PM >>> I just had a problem which is serious to me. As I usually do I was listening to a file when the bookport stopped reacting. I tried to lock and unlock it, which usually fixes the problem. Nothing happened. I tried to reset defaults. Nothing. I finally had to take out one battery for a half second or so. When the battery went back in it said something like not a dos disk. File initialization error. I took out the memory card and put it back in, it said the same thing. I took out the memory card, it did not react. I then formatted the card. I did this because I didn't want to take the chance of putting the other card in and screwing it up too. Okay, so now I have formatted it and can start over. How do I prevent this in the future? Well, I guess I have a new clean card to start with now. Thought you would like to know this, since I hadn't heard of these problems before. Kurt