WD82PURZ-85TEUY0 idle sounds

I have got a WD Purple 8TB - WD82PURZ-85TEUY0. Works fine. I am worried about its idle noise I noticed recently. It is a steady, girding/clanking sound. You can hear it here: https://www.youtube.com/watch?v=SGCh87oyuvc

The disk works fine under load. These weird sounds are present only in idle state. Is it normal?