MacBook Pro running Lion constantly spins up external hard drives while sleeping

My MacBook Pro 8,2 running Lion 10.7.2 constantly spins up its external hard drives (one Firewire 800 and two USB) while sleeping. Is there any way to prevent this? The drives will spin down for a minute or so and then spin back up, which is incredibly annoying. Have to shut the computer down to prevent this.
Thanks. I’m happy to provide more details if needed.

Might be Spotlight indexing...  you can turn that off.
Turning Off Spotlight | Mac Tricks And Tips

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