My external HD increases the kernel_task memory usage.

I use an external firewire hard drive, SmartDisk FireLite, on my eMac.
the kernel_task memory usage (RSIZE) goes up to over 400MB,
whenever I connect my external hard drive to my computer.
normally, the kernel_task uses 100 to 150 MB
with all scanner, printer, keyboard, mouse, and etc connected.
soon after I disconnect the external HD,
the kernel_task memory goes down to the normal usage.
I don't know how kernel_task works, so I am not sure if the issue is normal...
Does any kind of external hard drive take a lot of memory for kernel_task???
If I use a USB hard drive, this won't happen???
400MB for kernel_task is a lot to me,
especially when i try to use softwares like photoshop, indesign, and etc...
so, if I could save the kernel_task memory, it would help me tremendously.
I would really appreciate it if you could give me any suggestion or answer.

Thank you very much for mentioning the application.
I've already downloaded and tried the shareware.
It was great and provided more free space after running the program,
I am pretty satisfied with the results I got.
In fact, it gives me about 250MB more in free space on average.
It would almost cover the memory loss caused by my external HD.
However, I still hope there would be a way to stop my external HD eating much memory...
Recently I found my ipod shuffle which I've also used to store files won't affect the kernel_task at all and barely use memory...
I was thinking to get a new external HD as an option,
but I am worried if the same problem would remain with the new HD...

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My external HD increases the kernel_task memory usage.

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