I'm finding the 160gb hard disk in my macbook to be a tad limiting and I was planning to switch it out for a bigger one. A few questions come to mind: When I have the new hard disk, do I have the option of choosing either doing a fresh install of Leopard on my macbook using the disks that came in the box or creating a copy of my current hard disk on to an external and reinstalling from that? In terms of choosing the new hard disk, Western Digital seem to be the most popular (on amazon, also fairly cheap). Not had a hard disk from this manufacturer before.. anything I should know about reliability? Also, what's the big difference between 5,400 rpm and 7,200 rpm (aside from £13)?