Katie, I tried downloading the world history RFBD test book again on the card that had about 44MB left. I got the same filter error as before when I put volume 2 into the D drive. So ... I had some other audio-plus books from RFBD, and one of them was a two-disk book: book no. MM824, America: Pathways to the Present; it is a US history book. It downloaded well: both disk did their thing, then I went back to disk 1 and 43 MB were transferred. It reads okay on the Book Courier also. So something must be wrong with their test book. Maybe you should check with RFBD. Do you want me to send you or RFBD the test book in question? I think the important thing is that another two-disk book downloaded very well. Do you have a test protocol, or should we follow the survey, or what would you like us to test, exactly? - Jackie McCraw