This is a strange one. I have had an MD Walkman MZ-S1, sport model for several years now. It has a multi-function joystick type operation. Well for some unknown reason when I move the joystick to "play" I now get a "blank disc" message. I've put the disc in my MD deck and sure enough it is blank! For some reason the unit is malfunctioning and erasing full discs when I go into play mode. Anyone heard of this problem before? I have dropped the unit a few times in its history which might have contributed to its possible demise. Can the firmware be reprogrammed to normal working status? Any suggestions? thanks, Walt