I recently purchased eight 4TB Black drives. I noticed that all 8 of them do a periodic head movement every 5 seconds (approx) even when idle.You can hear a quiet “chunk” and even feel it if you touch the drive. This happens even if they don’t have a data cable connected (just power is connected). All of them seem to do it. WD phone support didn’t seem to understand what I was talking about.
I have seen other posts about this issue, and there were no clear answers (previous posters seemed to RMA the drive). But in the other posts, there was only one driving exhibiting the behavior. I find it unlikely that 8 separate drives would do the same thing if it wasn’t a design thing. I was putting 4 of them in a RAID, and during the initialization (which took hours) they still did the periodic “chunk…[5sec]…chunk” but each one was doing it at a different time. I initially thought that the RAID initialization was doing it, but then did some further testing and noticed it even when they have the data cables disconnected.
Has anyone ever gotten a definitive answer about this?