I just got a 3 TB external drive and try to do a raid on IMac 27 mid 2011, after setting it up, the computer start going crazy for few sec and went to panic mode and shut down itself and try to reboot and no luck until I disconnect the external drive. after that reboot just fine BUT as soon as I connect the 3tb it goes off again, any help to recover my files from the external drive is greatly appreciated.