When hdd power off it makes moaning noise

[wegorin]

Here are some links to threads with same problem:

https://community.wd.com/t/wd2005fbyz-noise-when-pc-is-power-off/215513
https://community.wd.com/t/wd-black-spin-down-noise/198722

It is the exactly same noise that HDD makes on power off.