After owning my f700bt for two months I was very frustrated with the song cutoff from the sd card. I came across Boby's post who suggested reformatting the sd card and dropping down the allocation unit size. So, I dropped mine from 32K (default) to 8572 bytes. I've played about 40 songs so far and ALL of them play to the end. I just wanted to share my experience on this because I know a lot of you were going through the same problem. Thanks Boby!