Sudden Motion Sensor - hard drive specific?

[umiwangu]

Hi everybody,

I just upgraded my stock 160 GB Hitachi (13" MBP mid-2009) to a 500 GB 7200 rpm Hitachi (amazing difference) and I'm not noticing the click noise when the sudden motion sensor parks the drive heads. Is the SMS built into the hard drive itself or into the MBP? Do I need to be extra careful with the laptop now? (It was surprising how many times the heads would park, even just when picking up the laptop.)

Thanks in advance and apologies if this has been answered before (I did a search both here and on Apple's website and couldn't really find a conclusive answer).

Seth

http://support.apple.com/kb/HT1935

 

[spinnerlys]

It is built into the MacBook (Pro), not into the HDD, as many HDDs even offer their own shock protection, which conflicts with the Sudden Motion Sensor.

 

[umiwangu]

It is built into the MacBook (Pro), not into the HDD, as many HDDs even offer their own shock protection, which conflicts with the Sudden Motion Sensor.

I just wonder why I'm not hearing it as much, or perhaps the sound of the heads parking on this drive is much quieter than the stock drive. I checked pmset and sms is turned on.

Anyway, thanks for the clarification!