Sudden Motion Sensor, MacBook Pro 5,4, and Seagate Momentus 5400.6

I recently upgraded the HDD in my MacBook Pro 5,4 to a Seagate Momentus 5400.6 500 GB HDD. It is not one of the drives that has a sensor in it, so I was hoping to rely on Apple's on SMS technology to park the heads when necessary. I've found, though, that this isn't the case at all. Originally I would hear a "click" when picking up the MBP after sleeping it, but now I hear the drive still spinning after closing the lid, waiting a moment, and picking up the MBP. There is no indication to me that the drive stops upon "suddon motion", or at least it's not as sensitive as it was originally.
I used the Apple Terminal commands to check the state of the SMS and even to toggle it on and off, but I couldn't tell a difference. Is there anything else I need to do, or is it doing what it's supposed to do?
I'm running a mid-09 MBP (5,4) with 10.6.8.   

The SMS is not a part of the drive itself, it is a separate component normally located adjacent to the drive. It consists of a three-axis accelerometer that reports any motion of the computer to the Operating System. If it exceed a certain threshold, the O.S. causes the drive to park itself, presumably in anticipation to an impact. Some general purpose utilities, such as [MacPilot|http://www.koingosw.com/products/macpilot.php], allow you to enable or disable the SMS, there are also utilities specific for this.
An interesting application is [SeisMac|http://www.suitable.com/tools/seismac.html], which reads the info produced by the SMS and displays it as a graph, turning your Mac into a seismograph.
As for the operation of the system, I've found that if you close the lid on your portable and while it is updating the sleep image (before the LED starts pulsing), if you shake it, you will hear and feel the HDD coming to an emergency stop.

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