On Sun, 4 Nov 2018 16:19:45 +1100
Eyal Lebedinsky wrote:

> I then mounted it on a new mount point which I have no process using. I 
> started hearing
> knocks from the PC case, and touching the disks revealed that they all had 
> activity 1-2
> times a second, concurrently, leading to the louder than usual noise.

If it is an ext4 filesystem, then a newly formatted ext4 gets
background activity building some sort of internal data structures.
It eventually stops doing it if makes it all the way through. Possibly
other filesystems do something similar, but I know ext4 does.
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