You're worrying over nothing. The difference between 20 and 30db is the difference between leaves rustling and someone whispering.
this post was submitted on 29 Nov 2023
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Perhaps the higher rpm drive produces a higher frequency sound, and since energy scales with frequency^2, the amplitude comes down?
I'm surprised you can hear the drive to begin with
You need to be deaf to not hear an HDD, and Helium one are generally very noisy.
db is also not a totally objective value of how you will "feel" about the noise. Higher pitched sound might be 5db lower, but feel more disturbing. The regularity of it is also important, as irregular sound will feel more disturbing too.
I would suspect the quieter at idle is because of helium.
I have both drives and can confirm the old bruisers are pretty loud.
Drives are going to be a little louder doing a random workload than when idle or doing sequential work