I returned my drive. In a near-silent computer, it was driving me crazy. This kind of thing should be configurable.
It’s the first time in 10+ years that I’ve had to buy a Seagate drive, as it seems all the WD drives (and also their subsidiary, HGST) now exhibit this issue/‘feature’. I’ll gamble on the reliability of the Seagate rather than try to put up with unnecessary noise every 5 seconds.