in responce to your PM....
the block is exactly the same size as a drive itself, with holes in the same places, so you can mount it where ever a hard-drive can go. in the picture I'm using brackets, but only because my case has no HD cage in it. 2 hard-drives fit perfectly on it. It is expensive though.... that is a big chunk of copper, and a lot of holes..... As for it being overkill.... You BETCHA!!!

like this.....
Hard drives produce there heat very slow.... even the hottest of old Barracudas are more than happy with the faintest of breezes, thus, a cool chunk of copper in close proximity to it, will chill it to perfection, no need for paste or a prefect seat, even the stickers on the drive won't make much of a difference,