Imagine that you have a HUGE media library and all of it is kept on your trusty PC or Mac. Now imagine that one day, your computer’s hard drive crashes, and that your music library is now gone. All of the music imported off of CD’s which you might have lost by now, all of the music downloaded off of free-music web sites, and most importantly, all that money spent on the iTunes Store has just vanished!
You then remember that all your music is still on your iPod, safe and intact. You plug it in, you mount it to the OS, and then you realize that iTunes only allows the downloading of music from iTunes to iPod, not iPod to iTunes. (This is to prevent the stealing of music, says Apple). Do you really want to spend hours re-importing music, and repurchasing music from the iTMS? We didn’t think so.
Tutorial: Here’s a detailed tutorial on how to copy music off your iPod and back onto your computer.