ipod disk usage

[agila]

although i am thrilled about my ipod and brag abou tit constantly, i am a little disappointed that its 20GB disk is getting full.
in itunes i get the size of my music library to be
14.2 GB.

my "20 GB" ipod (which only holds 18.5 GB... why is that?) tells me that the music library on it is 17GB. there is no data on the ipod, just music.

preparing for a party this weekend i created a large playlist in itunes, solely out of tracks that were already in my music library (on the ipod as well), then i plugged the ipod and was disappointed to see my ipod disk space decrease by .5GB! the ipod seemed to be copying the tracks themselves over, not just a list of tracknames, as i thought.

is this normal? it just seems stupid to me.

--
agila.