Apple TV Seems Slow/Fragmented

Hi,
My 30GB Apple TV has been behaving strangely lately, especially when using YouTube. Every now and then it freezes and you can hear a lot of hard drive activity. It reminds me of using a computer that doesn't have enough RAM and is using the hard drive for Virtual Memory.
I only have 4.83GB of free space left on my Apple TV. Could this be the problem? When it was new it was very fast and responsive. But now it freezes a lot and crunches away at the hard drive.
Is there a way to defragment the Apple TV's hard drive?

in the PC world it's not good to use more than 90% of any drive -- can't say for MacWorld, though).
Same thing, it causes the dicectory to get fragmented and even corrupted, on the issue of de-frag, OSX doesn't need de-fragging, unlike OS9 and windows, although there are companies out there still providing de-frag software for the mac. Whether or not the diet version of OSX on the tv works the same way I don't know, however as Mike points out there isn't actually anyway of de-fragging, so it doesn't really matter.
If you are interested in why the issue is occuring, you might want to follow a diagnostic route, otherwise, I'd try a restart first and a restore if problems persist.

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<Email Edited by Host>

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First off, this issue seems to be isolated to bluetooth wireless devices and wireless network traffic. I have a Logitech G7 bluetooth wireless mouse, and my Macbook is the 5.1 version
I have seen other threads that are trying to blame their mouse lag on their monitor, and have said that plugging the monitor's power to a different wall jack fixed their problem. This made no difference in my situation. Even having my External monitor completely out of the loop, i still experienced issues with bluetooth mouse + traffic over the wireless causing significant hitching and lagging of the mouse during the period of the traffic (i.e. copying 500mb file over network).
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wireless ethernet + trackpad + network traffic = no mouse lag
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