Hidden (Embedded) Tracks: How do i dump them?

Suppose we want to keep Some of the preloaded tracks, and dump the rest… Couldnt we just go track by track, and delete that which we didnt want?

Also, do all the Fuze models come with the same preloaded tracks, or, would my 8gb Fuze have more preload than the 2gb Fuze… What is the approx. amount of space consumed by the preloaded tracks on the 8gb Fuze?