Ok guys, I got it and I want to show this information with you. I contacted bot Western Digital and Apple. The WD5000BEKT (aka Scorpio Black 500GB) does have the free fall sensor, like all the others scorpio blacks 500 GB and 750GB. The scorpio blues do not have the free fall sensor. In order to make it works inside the HDD bay of our beloved MBPs we have to disable Sudden Motion Sensor (SMS). My question is: does this procedure (disabling SMS under mac os x) disables SMS under win 7/bootcamp, too? Have some people experienced some problems with this WD model?