Assuming you are using MP3 s and you encode them at a max of 192kbs (more than adequate for in car use) you should get closer to 200 on 700mb disk. WMAs tend to be a bit smaller so maybe that is the way to goCheers **,
That more or less answers it 4 me. Ive got an 06ES, and thets about the only toy it dosnt have !!
Im sure i can manage with 100 tracks from the single slot !