After replacing a few 2010 iMac Seagate hard drives, I came across a few 2011 iMacs that did not have and external temperature sensor, or a wire pair going directly to the hard drives.

Having lab full of 2010 and 2011 iMacs has been pretty uneventful… until last month when their 1TB Seagate hard drives started failing. One after another, a few the machines would start acting weird and freeze up.