How much heat does a 3.5 hdd make?

Im thinkin about gettin a Cosair air 240 and some reviewers suggested installing a fan on the back section for the hdds. How much heat do they actually produce and is it really worth putting a fan in when its going to be mostly full of cables?
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  1. I think you would honestly be fine. With good cable management that case should have plenty of air flow. I would suggest getting a modular power supply so you can make it look clean.
  2. My own personal drive temps:

    In my case, i have a fan blowing air over my HDD (WD Black). Temp of the drive is 30 Celsius with a 25 Celsius Ambient.

    My other drive (Samsung 840 EVO SSD) is sitting at 31 Celsius, but is not getting much airflow where it is mounted.
  3. I got 2 HDDs and 1 SSD in a mATX case and I have not noticed any change in heat since I added two.
  4. Best answer
    Hdds by themselves usually don't put out much heat at all. That said, they are also stuck in areas of the case with either little to no airflow and/or are the recipient of ambient heat especially from a powerful gpu. Basically this means they just sit and bake. Having even a small amount of airflow across the hdd is a blessing and in more than a few cases this is accomplished by a larger or second intake fan, so is not an issue.

    If you are worried about it, use a program like speccy from piriform, its small, easy and free, yet has tons of decent info, including hdd temps. Hdd temps should be @10° above ambient, then push the gpu hard for 15 mins or so, it being the largest heat source, if the hdd temps climb past 20° above ambient then add some airflow, otherwise it's not an issue.
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