saving music from computer onto cowan d2 mp3 player

[lesprocol]

thanks for helping me to load onto my mp3 player (cowan d2 iaudio) now however when I load an album it appears on the d2 player fine but when I later load another album the first one has dissapeared and only the second album is saved. should I be saving on the mp3 player and how. included instructions are useless. thanks again...les