HDD After connecting, something writes to itself, what - how to understand?

Question

linux

The hoster replaced the disk on the server. After turning on the disk, I formatted it in Ext4 + Erase through the graphical interface.
Then I did mount.
A couple of hours have passed since then, but I can’t understand why my disk writes something and writes to itself, although it is empty and I don’t perform any operations with it, no new files appear on it.
What it is?
SDC disk