How to get more air to the bottom disk?

1. I have a disk that is on the bottom most rack that cannot receive air flow from the front fan because the front fan it too high. Is there any way to let the bottom disk receive air flow?

2. I intend to add fan b and fan a, does fan b or fan a helps to cool disk 3?

3. Should I installl the kind of hard disk fan that will attach above/below the hard disk? Any recommendations?

(note: rack above disk 1 gets very little/no air so i do not use it. i leave a blank layer between disk 1 and disk 2 for better air flow. i leave a blank layer between disk 2 and disk 3 for better air flow.)
(note: there is no point moving the fan down. if I move it down, disk 1 will not get any air flow.)

With the number of fans you have, I wouldn't be worried about hard drives overheating. From your pictures it looks like there would be plenty of air exchange in the case.

Do you have any reason to suspect the drives are overheating?. Overheating of hard drives is not usually a problem in desktop PCs.

It does depend on what the air temp in the room that the computer is in. So if your room air temp is 20 then the hard drive will be cooler, but if the air temp is 30 then the hard drive will hotter.

Also it depends on what you are using to measure the hard drive temp. 40 degrees should be well within it's range as from what I have seen most hard drives are safe up to 50.

i assume you are talking about degrees C & not degrees F.

As I mentioned in post #4 it will depend on what the ambient temp in the room is. If the room temp is 30 then you will have a very hard job keeping the HDD below 40.

As I have said I would not be too worried about it. You can often spend a lot of time & money trying to accomplish something that really does not result in a better outcome.

For the average home user HDD temps really aren't a problem unless they are well over 50.

What program are you using to measure the HDD temp with, sometimes these temp readings are not completely accurate.

Hi,
Besides drilling out the rivets and lowering the fan to the other holes and reattaching it ?
No
You might also think of upgrading the fans while you're at it
Even the exhaust fan.
Not sure how many you have but exhaust is equally important for ventilation.

It appears you can move each HDD up one notch. That way, the bottom fan would move into the airflow of the fan and the top HDD would still have airflow across the bottom, which may still be enough to keep it below 40°C. At least it should be easy to do without any surgery on the case.

Good eye Lady :)

I also notice the front cutout is not really as wide as a 140mm fan
Seems to me 2-120mm's would fill the entire space better ?