Iphone file structure

I have a program that allows me to backup/view iphone file structure. Is there any book or tutorial that describes what the file structure is. An example would be how songs are stored.. There are a bunch of folders similar to f01, f02, f03, etc but how the songs are stored in there doesnt seem to make sense to me..

I would like to learn the complete file structure of the iphone or atleast have a reference sheet describing what the folder are..

 

Surely there is some tutorial out there that discusses how and what the file folders are on the Iphone4