WD RED noise difference between old and new models

Hi, i have two new WD RED: one is refurbished (warranty ends in 2016), the other one is brand new (2015 production). The refurbished HD is quiet like a WD Green that i have. The brand new WD RED is not that quiet. It has an high pitched noise. It’s low but audible. Is that normal? WD changed some components and made the Wd Red noisier than before?


I recommend you take a look at this link.

How to tell if the noise or sound the drive is making is normal

i think it’s normal. It’s just the noise of the motor, an high harmonic that is audible only in the new hd.