Maybe not... I have three hard drives in my sizeable tower case, plus an SSD tucked away by the CD burner. There is a good sized fan blowing directly on the hard drives. But... the guys who built the computer for me stacked the three hard drives one on top of the other, with no more than one or two millimeters between them, leaving two empty drive bays on top of them. (I told you it was a sizeable case!) This, I think, was less than ideal, and a month ago when I went to vacuum the dust bunnies out of the motherboard, I moved the drives so there is an empty bay between them. I didn't take any before/after temperature measurements, but I'd think they have to be running cooler now.

tanstaafl.