Hello..i have my Sony Hi-MD Walkman MZ-RH10 MP3 Player,but when i put some music on it...and remove it from my pc..it tells me no track,but if i connect it on my DVD player,i see those tracks and i can play them through from my DVD player and sometime when i move it from my pc it says erro and asking me to format the disk..so what wrong with my Sony Hi-MD Walkman MZ-RH10 MP3 Player(then i can use any mini disk or only sony mini disk?)