Strange noise coming from 10TB drives (WD100EFAX)

I have been reading a bit of this very long thread through, and seeing the frustration radiate from all those who are experiencing strange sound issues with their WD drive. I simply can not understand that WD is not open, and inform about what is the reason, especially in a forum like this, dedicated to WD products.
If you got a serious explanation that you could relate to, then you could partly live with the sound, but especially calm down, so you do not go and are worried if there are, or will be, serious problems due to there “unknown” sound problem.
See for example this thread

it is also several years old, but does not have as much traffic as this, maybe because not many people use 2Gb drives, but the problem is exactly the same. It’s really really annoying, yes I have no words for it, that one can not be informed the reason for what is the cause.