WD Red extremely loud grinding noise

[Monstieur]

I got two new WD Red 2 TB drives for my RAID array. One or both of them (I can't tell) randomly starts making this extremely loud grinding noise continuously for several minutes. It's louder than all 6 other HDDs put together. It's about as loud as an electric razor - no clicking, just a continuous grinding. I rebuilt the entire array and there are no bad sectors on either of them. The noise randomly starts and lasts several minutes and then goes silent. It's not related to disk activity.

 

[Zepher]

My 1TB Black made a grinding sound every now and then, WD support had me RMA the drive since that is not a normal sound. drive operated fine, just made that loud grinding sound.

 

[Ultima99]

Option 1: Call WD

There is no option 2.