Good post by Chris Pirillo:
Many of you have asked me for a recommendation for a partition tool. In the past, I’ve recommended Partition Magic, which of course is not free. Wirelesspacket gave me a link to a free partitioning program that appears to be quite good!
PartedMagic is an open source project. It is a Linux LiveCD/USB/PXE with its elemental purpose being to partition hard drives.
What is a partition, you ask? Well, to put it in simple terms… take your Disk on your computer. Usually, your C drive of course. You can use this tool to create “partitions” on it, that is, separate sections. You can have one that boots a Linux distro, one that boots Windows, and even one for your music files. You see where I’m going with this? A partition tool will help you divide that hard disk, and manage the separate sections… or partitions.