Dell T20, ECC RAM 24 GB, 4X3 TB HD Freenas 9.10, RaidZ1. I looked up the Toshiba P300 (ada0) and it's temp is @42 C. Toshiba specs lists its operating temp as 0-60 C, 7200 rpm and recommends server use. The other Seagate also 7200 is running about 41 C. I have a Hitachi 4 TB 7200 (parity) in an Unraid system and it's temp is about 30 C. This is kind of an experimental build so I am not worried about any data lost or disk fails at this time. I did have scrubs and SMART setup and the HDs seem to be running continuously. The Dell T20 case is kind of tight and the HDs are kind of packed in but no more than normal. Thanks again for the responses and help.