Delay with USB drive

I have a Lacie USB drive connected to my MacBook. Frequently, when I do certain things (not sure what) but definitely when I click to save a file the drive seems to "wake up" even when Finder is just being displayed. The wake up takes about five seconds and is an annoying delay. Then in a minute or two I can hear the drive shut down, waiting for the next time to become an interruption. I'm on Snow Leopard but it occurred before the update.
Is there any way the wake up behavior can be stopped short of unplugging the drive? I could understand a delay if I actually selected the drive but not when I'm taking other actions that don't require the drive.
Thanks.

Adam, thanks for the suggestion. Finder Preferences wasn't the answer but it caused me to look closer at the Energy Saver preferences. I unchecked "Put hard disks to sleep when possible." I'm not thrilled about having to do that but I'll see how it works for a while. Would be nice if I could specify specific disks to sleep or not.

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    Rather than join the AppleCare support community forum, what I actually wished to do was to send an email to apple with some suggestions on how to improve OS X Lion. That was, surprisingly, impossible to do. So I have wound up here.
    Too late! You're in the community now!
    Start answering questions, we will tell you when you can stop and when you cannot.
    I guess you didn't read the agreement you signed carefully.

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