I have been trying to buy a WD Blue HDD from WD and have had a bad experience with it all and FWIW I still don't have a drive, but in research I discovered that they have an issue where they park the heads after 8 seconds of non-activity or at least that's how I read comments in reviews. Would that create the noise you hear? I would guess not.
Given that its a mechanical device, something in its assembly might not be loose perhaps. I'd gently shake it and listen for a rattle.
I'm an intermediate user at best. I comment hoping that the info may help you but don't take it as expert analysis.