Hi Folks! I face the following decision: Getting a 2011 MBP this Friday with the Hitachi HTS725050A9A362 500 GB 7200RPM drive. Currently I have a Mid 2009 MBP with the Seagate ST9500420ASG 500 GB 7200RPM drive. The Seagate drive has no issues so far and it has a built in sudden motion sensor. I'm not sure if I should flip the Seagate in den 2011 MBP (the 2009er wil go to a colleague). In June I also want to upgrade the system drive to a SSD and put the 500GB drive into an optibay. Will the MBP built in sudden motion sensor work for the optibay drive as well? If not, it would be better to keep the Seagate in order to have a sudden motion protection of the drive in the optibay, right? Your comments on the two drives would be helpful!