Anyone with the HD handlebar mounted mp3 player know if there is a size limit to the SD card you can use in it? I put 14 hours of music on a 2gb card and it will not play. Tried putting just one song on it, same thing. Had same problem with a digital camera once also. Found the device would not support that large of a card. Have a 512mb card in it now and it works just fine. So, how big can I go?