
I've always been told that a Mac doesn't need defragmenting because it does it all for you. I've changed my mind however after reading this article...
"OS X does a great job at minimizing file fragmentation by rewriting files in contiguous space when a file is opened, is under 20MB and contains more than eight fragments. This works quite well to prevent heavy file fragmentation, but what it doesn’t prevent is free space fragmentation."I did some more researching about programs to use and who uses them, come to find out that a lot of people degrag their Macs including "the Apple folks" in CA!
Click Here to read the full article I mentioned above. It covers more info about defragmenting a Mac and lists several programs you can use. The program I ended up using is iDefrag ($30) I've been really happy with how well and fast it has worked!