I have a USB that is full of music so I bought a 250 GB external hard drive as it did not cost much more than another 16 GB usb. I dragged all my music from Windows Media Player into it as I did with the USB and the music will play on my PC through Media Player but when I plug the external hard drive into my stereo at work it reads it for a while and then says "no song". The USB plays ok on that stereo, what am doing wrong apart from being an old person trying to master computers? Steve