... They increased up to 33/34 (please notice how the delta is almost constantly 1 °c between the two hdd), to stabilize more or less at 31/32 . My best guess is that it depends on the environment temperature...
It can be useful to review the
entire airflow path through the equipment. Not just the air flow in, through the fan, and around the hard drives.
Examine the air flow route
beyond the drive locations. What restrictions impede the air trying to
exit the case? Does the airflow have to go around tight corners, past large cable bundles, etc?
Are there other fans in the case that assist, oppose or influence the new cooling fan's air flow?
In a good airflow configuration the temperature difference between ambient and drive should be relatively consistent, for a given drive workload (heat output).
A good fan driven cooling arrangement should maintain the hard disc temperature rise to a fairly modest delta. What temp differences are you seeing above ambient?
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