- Jun 10, 2011
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.