Strange hard disk noise when turn off - with audio

Hi, I recently purchased a new hard disk for my Ex2 Ultra Nas:

WD Red Plus - WD40EFZX, 4TB

When I turn off the NAS there is an strange noise…too much noticeable, I suppose is the headers… The rest of time, all perfect. All test passed.

Kind regards

Hi @jant,

Please refer to the article Why Does My Hard Drive Make Noise?: Why Does My Hard Drive Make Noise?

Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting: