well, kinda hard to tell since you didnt realy give any useful info on the mp3 player. If it conforms to usb standards and acts as a usb mass storage device, it can be mounted under any linux distribution with basic usb support, so definately in mandrake it will probably work, yes. And most likely simply by doing:
mkdir -p /mnt/mp3player
mount /dev/sda1 /mnt/mp3player
# and whne finished
some will write the tracks on the umount, so dont be alarmed if it seems to jam for a while..