My new WD20EZRZ makes strange sound when idle. It’s not parking sound (i am aware of wdidle utility), the disk makes this sound even in DOS, BIOS, even without data-cable. I recorded it: https://vocaroo.com/i/s1hCZvzNsoj6
Other than that, the disk works fine and smart is ok. What is this sound? It’s very annoying.