HDD won't spin down or power off

Hi,
I'm working on my new MacBook Pro i7 with a 500GB 7200rpm HDD for a week now and noticed that altough the screen goes to sleep the hdd doesn't.
I've double checked and reset the energy settings. I've even deleted the plist files for it. I've also repaired disk permissions.
Still the slight humming is audible and I can even feel the vibration of the drive (which I learned is normal on the unibody MBPs) long after the screen went black.
Besides being a little noisy it also eats lots of battery power and that's a real problem in combination with the almost constant use of the nvidia gfx chips.
To me it seems like a faulty firmware or maybe some setting on the hdd for energy saving or performance.
Firmware Version is: 0008APM2
Is someone else having these problems?
Has anyone found a solution for this?
-thomas

Sounds like the sleep problem that we're all having with the 2010 MacBook Pro's...
http://discussions.apple.com/thread.jspa?threadID=2416586&tstart=15

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