Hello again, 
I have two SATA drives (the Western Digital being the newest) in AHCI mode. There's no problems detecting temperatures on the Seagate SATA even when it goes into power saving mode. 
I have attached 3 reports, two of which are S.M.A.R.T. status reports, hopefully providing enough information. 
Regards, 
Barry 
WDC WD15EARS-00Z5B1 (SN WD-WCAVU0499212) - REPORT.txt 
ST3500418AS (SN 5VM2JJ9N) - REPORT.txt 
diskctrldump.txt