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  1. #1
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    hard drive cooling fan

    For the record, this question is about MY computer - LOL - so many of my questions have been about various friend's computers.

    I just installed a slot fan next to my video card and also rigged a case fan to cool my hard drive. I "hung" the case fan on a bar (DELL COMPUTER) running the length of the computer - the bar serves as a sort of brace on the inside of the tower. Anyway, the case fan is hanging on the bar about three inches away from the hard drive and is blowing away from the hard drive (which hangs on the front of the computer tower. My question is should I reverse the air flow and have the fan blow towards the hard drive.

    I am using the extra fans because I have had an occasional time when the computer would shut down and restart on its own - making me think that it may be overheating. The other fans built into the tower is the power supply fan and a cpu fan (has a shield over the cpu and draws the air up and out of the case.

    Thanks for your help.

  2. #2
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    Re: hard drive cooling fan

    Sounds like you have a real opportunity here. Have you see this <!post=post?,184792>post?<!/post>

  3. #3
    Plutonium Lounger Leif's Avatar
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    Re: hard drive cooling fan

    Having the fan blowing towards the HD will in all probability increase the airflow over it. The outgoing airstream is quite directional whereas the intake of a fan tends to create a low-pressure area drawing in air from all directions. (Does that make sense?)
    That said, I would say you ideally need to keep the airflow in one direction. I can't be sure from your description whether the HD fan is at right-angles to the general front-to-back airflow or is hanging 'behind' the HD. If the latter, I would suggest keeping the airflow in the same direction as your PSU fan - no point in having them fight against each other.

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    Re: hard drive cooling fan

    ok, if this is the "common" Dell where the HDD is "upright" in the case, not the typical horizontal setting, the the extra fan for the HDD will not help. All we have at our three plants are Dell so I have a little experience with them. The HDD circuts should be facing the front of the case so that the air intake draws across the electronics. If you reverse your fan and it blows across the HDD then you are trying to blow out the intake, make sence? Removing the rear fan and adding a higher RPM/CU fan will help some. I have tried the 5.25 bay fans, rigging fans all to no avail so this is the best advice I can give you.

  5. #5
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    Re: hard drive cooling fan

    FWIW I've always heard/read that you should have equal amounts of airflow coming into and out of the case. In other words, try to match the volume of air blowing in and out of the case. More fans in than out will create an area of high pressure inside. More fans out than in will create a low-pressure quasi-vacuum inside.

    It sounds like you have too many fans blowing into the case. Perhaps you could change the direction of one fan to blow out and that will reduce the heat enough so that you won't have to worry much about your HD temperature.

    HTH

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    Uranium Lounger viking33's Avatar
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    Re: hard drive cooling fan

    trebor,
    Somehow, I can't quite picture a fan hanging in the middle of the case doing much good at all, but if it were to be facing one way or the other, I would choose having it blow towards the HD to create something of an airflow around the electronics. Ideally, the airflow should be balanced intake vs. outflow. An intake case fan on the front and a same sized fan blowing out on the rear. Internal fans on the CPU, (video card if necessary) and of course on the power supply. I think additional fans in the interior just stir up airflow to hopefully force the warmer air towards the exit.
    Bob
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    Re: hard drive cooling fan

    Hey Kent,
    Yes - it is a "common" DELL and the hard drive is hanging vertically on the front of the computer. Now that I look carefully, there are air-intake vents on the front of the computer which would allow air to flow over the hard drive. So I guess having the fan blow away from the hard drive is the right thing. That will draw more air over the hard drive from the air-intake vents. At the very worse, I am moving the air "around" within the case and that can not hurt things.

    In any event, everything seems fine right now. Thanks to everyone for their input.

  8. #8
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    Re: hard drive cooling fan

    > At the very worse, I am moving the air "around" within the case and that can not hurt things.

    It isn't that simple. The worst you could do would be to take a system with a smooth and efficient airflow and cause it to become turbulent, this could seriously reduce the overall cooling effect! <img src=/S/cooked.gif border=0 alt=cooked width=50 height=46>

    System designers use sophisticated modelling techniques to understand the airflow impact of moving vents and fans to avoid exactly this sort of issue.

    StuartR

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    Re: hard drive cooling fan

    IMHO - Forcing air towards the hard drive would be a bad thing for 2 related reasons. First, unless you have a HEPA filter on all your air intakes, you will be "slamming" dust particles into your hard drive. That will eventually cause a buildup of particles and trap heat, defeating your purpose. Second, hard drives are not 100% sealed. I would not want to force tiny dust particles into the innards of my drives but to gently suck them away. Therefore I highly recommend you have the fan move air (and heat) away from the drive and towards your exhaust vents.

    I realize this may seem far fetched but high density drives pack more data in smaller spaces - that microscopic harmless dust particle of yesterday may act like huge boulder scraping across the platter today. Why else to they build drives in dust free environments?

    And moving more air around the case is not necessarily a bad thing - if nothing else, it helps move heat away from other heat sensitive components (memory, BIOS, Chip Sets, cards, etc) to where the suck-in and blow-out fans can do their thing.
    Bill (AFE7Ret)
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