August 8, 201015 yr But hard drive surfaces aren't on the micro or nano scale. You may have been right about 40 years ago, but not today. Hard disks today work on the nano scale. Joe L. No, I'm right about what I said. Hot spots as it relates to the discussion we are having don't reach in from the hard drives outer case directly to the platters. On the cpu there is direct contact so hot spots on the surface of the cpu slug do matter. The argument was whether in a 5-in-3 a hot spot could develop. I say no because air is moving and wicking away heat. On a cpu air movement over the surface isn't enough, the heat sink must remove a huge amount of heat relating to the surface area of the slug. There aren't too many 65 or 90 watt hard drives so the problem is non existant. In a badly designed 5-in-3 all the drives will get too warm, not just 1 or 2 of them.
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