Vaio 20GB vs 40GB ?!

[emqvaio]

Besides weight, dimension, disk size and price, is there any other differences between 20GB and 40GB ?!
Does both have the same battery playback time ?

[ivan-d]

no i don't think so, i only got the 40gb one because i got hust over 20 gb of music, so i couldn't really use the 20 one without excluding some of my music, which kind of defeats the purpose of a music jukebox!