using it on mac--works but

on my g5 os 10.5–drive is recognized–i have  no microsd on it–cannot make playliest but can creae folders but not recognized but!!! if i install the mp3 in the music folder it recognizes it–so far i love it–got it after my ipod toch got rained on--  the sound with sandisk earplugs is fantastic–i use my portavle speaker system and it works fan tastic–i have no complains–i plan to uy small sd cards to use as playlists–we will see what happens as i suspect it will read the internal memory ad just add the songs on the sd