iPod problem - erased my hidden music folders

Hey guys. I was toying around with my iPod today and when I decided to clear it to sync it up with my library, I noticed that 2 gigs of space were still taken up on the thing. Because of this, I went into my iPod in explorer and deleted all the “FXX” folders in the Music folder under the Ipod_Control folder, all of which are hidden folders. Can you tell me how many “FXX” folders I’m supposed to have, and if I have the formatting right? For example, is it F01 or F1?

I’m using the 60gb iPod Video.