i have a Maxtor ATA133 160Gig 7200Rpm hard drive installed on one of my systems and if it is on idling or spinning the thing pulses. For example if you had a subwoofer it would vibrate causing things to rattle, this is the same way. when i'm just sitting there i can feel it shaking the cabinet, i tightened the screws and it lessened it. is there anyway to fix it more, or is there something wrong with it. By the way its a new HD from maxtor from an rma.