how old is your ipod? the first windows ipods did not work well, or at all, with macs. i think it wasn't till the 3rd gen ipods that could work with both computers, if formated with the windows ipod updater downloaded from apple. like i said, thats what i did. it came mac formatted, but i wanted to use it as a hd too, so i downloaded the ipod updater for windows from apple, pluged my ipod in, and ran the updater. now my ipod says windows formatted, and has read/write on both os x and win xp.