The entire HD is 40, we only get 20 GB, still a quite nice amount for about any trip I could imagine, or et least a month around town ... Btw, it'll stream right off your iPhone too, so if you use iTunes, Rhapsody or Spotify or something like that you can just set your phone to stream your playlists.Not bad at all, 40G B is a good amount, but I know i can easily fill that up.
Are there specs on how fast it's file transfer/reading rate is?