Chosen Solution
My iMac has a Seagate drivel model number st3500418AS. Here on ifixit.com, there are only 2 options for brands on the internal HD replacement. WD and Hitachi. I am very hesitant to buy these because I have seen youtube videos demonstrating the difference between the WD and my Seagate drives with regards to the thermal sensor that is specific to 2010 and 2011 iMacs. However; I do not know if the Hitachi drive is compatible regarding same thermal sensor. I can find other sites that offer Seagate drives, I feel safer to purchase from there. Any insights on the Hitachis?
Buy the Hitcahi from a reputable seller that has a good RMA policy. IFixit may be sold out. The thermal sensors are different 922-9215 for the Hitachi 922-9216 for the Seagate 922-9622 for the Western Digital
