I'm very new to Mac and have seen/heard lots of discussions about partitioning your hard drive. Is this something I should be doing? How and Why? I use my computer for personal use and mostly internet surfing as well as some downloading of torrents, etc. I plan to use an external hard drive to store most of the movies and video files. Can someone please help me understand the reason and method for partitioning? Is there a tutorial out there that could assist?