help plz

[asfand]

i was trying to copy some tracks in my psp i connected the usb wire and went on removable disk where you can copy the tracks to your memory stick, when i opened the file there were no folders visible such as psp and isos.before that i dint experience such a fault i used to copy music and videos and it worked fine,i formated the memory stick alot of times but it didnt work,sometimes there was only 1 file visible which was the psp one and when i tried to go on it it said the file is corrupted and on and on i dont know wether there is a problem with the memory card or the psp, when i run umds on my psp and save them, no problem occurs the memory car saves them but i try to put games or put music on my memory card i cant find those folders which i can store them to,does anyone know a solution or does anyone know whats wrong? ill be very thankful to you!