How To Quiet A Ugreen 4800 Plus Without Sacrificing Drive Temps

I recently got a Ugreen 4800 Plus NAS, and it is basically perfect for what I wanted. Four bays, enough CPU, enough RAM, nice build quality, and it does not look like a sci-fi router from 2012.

The first thing I did was wipe the OS it shipped with and install TrueNAS. That part was also great.

The not so great part was the noise.

I expected it to be louder than my old Synology, mostly because I moved from “HDDs in a plastic box” to “a more PC-like NAS with more airflow”. Still, it was louder than I thought it would be, and it had this annoying behavior where the fan would randomly ramp up. Which is exactly the kind of thing you notice at night.