I have 3 of the 847's here. Even after taking measures. They are louder than the HGST.Sounds like a jet engine at startup lol... goes down if u wait a minute or 2 but I wouldn't call it quiet
My Define R5 housing my X10DRL-i with Noctua fans and tweaked ipmi settings is quiet
Probably have to change the highs on that 847 - but don't think I can on the HGST
Have tried swapping the fans before.... Sadly it doent really work. There is a lot of air that needs to be pulled through the front of the chassis and then out the back to cool disks and the system components.
The HGST has a fixed algorithm. I have tried hooking a cable up to the console port. but it looks like its outputting SES. not much that you can do there which you cant also via your controller and sg_ses and simmilar utilities