My MacBook has killed 3 hard drives in the past month (WD 750gb 7200RPM drives) so a friend of mine gave me the old 320gig segate drive from his Lenovo ThinkPad laptop to try it with. the drive is in there and 10.9.4 is installed but should i disable the Sudden Motion Sensor? is that whats killing these drives? ive had it OFF it is now on again due to the re-install... should i turn it off again or keep it on with the different drive? Thanks!