so my new iBook is on its way to me, and i'm wondering about partitioning the HD. On my current (crappy Dell. yay switching!) laptop, I have the HD divided into two partitions. one is for the system and the other is for music and photos and other files like that. is it possible to partition the hard drive without reinstalling the OS? If so, are there any reasons NOT to do it? I know I was told on my Windows machine that it could help avoid fragmentation and assist in some way with system stability. Are there these same concerns with Mac? Thanks!