I've got a 40 gig iPod, and 50 gigs of music. so, the I'm not just adding music to blank areas of the hard drive as my updates change, I'm erasing old music and adding new music. My question is, if I had a computer HD that was this full I would defragment it, but I don't know of any way to do this on the iPod. I did reformat it and am now in the process of putting everything back on. that should help but will leave me with the same problem not too far down the road. any ideas?