I just finished the process of adding 8 new Seagate Exos 20TB drives to my TrueNAS core system. This question has been asked a lot and it's known seagate drives are loader then most durring operation. Though i could not find anything related to a consistent "shudder" through all my new Exos drives. I have attached a audio clip in the link below. Have any of you come across this specific sound before.
The drives are in a Fractal Design 7 XL case with rubber bumpers in all trays. The case hold 9 WD Red's 12TB, and 8 Segate Exos 20TB. All 17 drives are connected to a SAS 9305-24i in IT mode. Running TrueNAS Core 13.0-U5.3
Audio Clip:
https://whyp.it/tracks/151914/seagate-exos-20tb?token=X8hOc
As an update, the sound and drive health was "normal". Though I did manage to dampen the sounds substantial.
To do this I installed rubber pads/stickers where the fractal design HDD trays touch the case. I used three pads per tray at three contact points two going through screw holes. I also added a rubber yoga mat (cut to size) under my case 6m thick.
The yoga mat was cheaper to buy than anything similar in size that I was looking for :)
Here is a link to the rubber pads/stickers. Really good find.
https://www.canadiantire.ca/en/pdp/likewise-self-adhesive-medium-duty-felt-pads-wall-and-surface-protection-1-2-in-brown-24-pc-0460802p.0460802.html?rrecname=customers%20also%20viewed&rrecreferrer=search&rrecproductid=0460802p&rrecproductslot=1&rrecschemeid=search1_rr&rrec=true