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Originally Posted by Colt357tw
the heat spot is not on the sides of HDD, but in the motor hub and controller IC on the PCB. I would use two Al plates with barbs on opposite side and run a loop between the plates, but that's just my thought :P
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wrong
HDDs are constructed so get cooled on the sides. Thats also wy they are screwed into metal boxes in almost every computer case, to give a little heat away to the material of the pc-case.
Yout can't cool the ics, because they are to small an on most modern hdds they are plated with a protective sheet metal and foam (see seagate or samsung).
The really hot ics are on the other side of the pcb and connected to the massive aluminium frame of the hd.
The motor too is directly connected to this massive block. The sheet of metal on the top on the other hand is not connected with any of these part and covered with plastic in most cases.
Cooling the top or bottom of a hdd would do effectively nothing, because the surface of both is not meant for cooling (see wd hds with a not exactly flat top). You would only stop the natural convection on both sides, which results in a worse cooling of the hd.