I have the 150 Raptor and its my boot drive. Whenever I am idle and probably in load as well, the raptor arm goes back to the beginning of the plater every single second. I timed it with my stop watch and its directly every second. I updated vista 64 today and also nividia for the 8800 gtx. I dont remember it doing this, at this time, there are no programs running and just the normal processes. Any help or advice? I am going to leave it running and go to best buy to look at a lappy case, be back in a about an hour and see what its doing then, maybe its working something out, but this dont seem realistic to me. It was not doing this before.