IIRC, default iTunes setting, like most others, is 128Kb, but it's easy to change, and set it at 320Kb variable bit rate. Depending on what size HD your 'puter has, you might want to get a nice big external drive and put your library on there, then pick up a portable HD and copy onto that as well as a back-up. Your iPod is a backup too, and as I found, very useful when I lost my entire library due to a stupid cockup on my part. It might seem over the top, but when you've accumulated a large library of stuff from lots of sources, like borrowed cd's, downloads, ripped personal cd's, amounting to thousands of tracks, then the thought of losing it isn't worth contemplating. My library is around 9000 tracks and growing, and there's still loads of stuff in my cd collection I haven't ripped yet.