I couldn't see the reason of paying Apple $50 to upgrade my HD to 7200rpm when I could do it myself. So this is what I did... I went out and bought a 320gb 7200rpm drive with 16mb cache for $69.99. I also bought a 2.5" SATA drive enclosure for $9.99. I pulled the stock 500gb 5400rpm drive and put it in the enclosure. So for about $80, I now have a faster drive in my mac AND I have an external drive to use for Time Machine backups or whatever I might choose to do with it.