i just bought sony d-sj301 sports walkman and its not playing the CD R that i already have and they were burnt at the speed of 40X which was the maxium speed for those Cd R.I just wanna find out at what speed i should burn the CD R that my walkman plays it.It is supposed to play CD R/RW.I will greatly appreciate if you guys help me finding the speed at which the walkman plays CD R....may be some of you have that walkman already and can help me.