Do I need to? Or is there a way to Defragment a HDD?

Hi everyone.
My background in in working on Windows. I'm not new to Mac as I've been working with Mac OS X for years.
On a PC I would defragment the HDD every once and a while.
Now, I'm solely on a MAC.
Working with video I've often times just about maxed out my internal and external HDDs. However I always end up deleting old unnecessary footage and shuffling stuff around to create more space.
Do I need to defragment my HDDs? Is there even a need for that with Mac? I was reading that it wasn't really necessary but then I recently read an article stating that it may be necessary if you work with video and that there were 3rd party applications to do it.
Any thoughts and ideas are appreciated.
Thanks.
-Fraky

You probably want the article that relates to OSX not OS9.
http://support.apple.com/kb/HT1375?viewlocale=en_US
While file level fragmentation is not a real issue, directory optimization may offer some significant benefits. This is why Disk Warrior ought to be in your tool box. If nothing else, it is a good program to make sure there are no issues with your directory structures.
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