afaik the ic's on the bottom dontmake nearly enough heat. on a old hdd i wouldnt bother but a newish one it might be good idea to stick a passive heatsink or heatspreader one. that allows it to store/disipate the heat without airflow...
maybe just get a flat sheet of copper and stick that onto the ic's and have that going round to the side and soldered to the copper pipe? that would be plenty...
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