Kernel task when using Firewire external usb drive

Hi, I'm using an external 320GB Iomega USB drive that has both usb and firewire cable sockets. When i connect the drive with the firewire cable to my mac (MacBook Pro) the CPU usage increases. Specifically, kernel_task usage goes up and stays constant in around 3% and sometimes it goes higher and stays high for longer periods.
Does anyone knows why this occurs and how to avoid a kernel_task CPU usage increase?
Greetings,
C.

It's probably Spotlight Indexing the external drive, if you don't want this to happen open System Preferences/Spotlight, click the Privacy Tab then drag the external drive icon from your Desktop into that box.

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