[weblacky]

My initial thought is what we all fear...did you not put padding (cardboard) between the BACK of your SCA converter and the rear of the HDD? because if those solder joints coming out the back of your SCA converter touch the rear casing of your drive.......ouch.

Otherwise heat is caused by weak resistive connections. So I'd assume the connection between your female socket of your molex connector and the rear pin of the card's power connector wasn't flush, (in all the way), and was barely touching inside, causing Joule's law to take affect and create intense heat at the touch joint.