USB drive kills wireless connection?

I have a MacBook Pro Late 2008 2.4ghz running OS X 10.6.4. When I plug in my LaCie portable HD via USB, it almost always kills the wireless connection. The LaCie is bus powered, and the connection is via a single USB port.
The LaCie works fine. I never have a problem with it. But it not only has a tendency to disconnect my wireless connection (to a Linksys wrt-54g), but it prevents my MBP from reconnecting. The airport icon will keep searching, and pop up the wireless connection window, but when I try re-connecting to my wireless network with WAP password, it'll fail to connect. When I eject the usb drive, wireless will work fine again.
This doesn't happen every time, but it's fairless consistent. Any ideas on what the problem is and how to fix it?

Obviously, this isn't supposed to happen. Try resetting your computer's PRAM. If that doesn't do the trick, reset your computer's SMC.
If that doesn't do the trick, it could be a software issue. You can search Apple's download website for the correct Combo Updater for your OS (10.5.8 for Leopard, 10.6.4 for Snow Leopard).
If that doesn't do it, I would take the machine to an Apple Store or an Apple-Authorized Service Provider and have it looked at.
Good luck!

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