- May 2, 2017
- 5,015 (3.07/day)
- Norway, currently in Lund, Sweden
|Processor||AMD Ryzen 7 5800X|
|Motherboard||ASRock Phantom Gaming B550 ITX/ax|
|Cooling||Aquanaut + Laing DDC 1T Plus PWM + Corsair XR5 280mm + 2x Arctic P14|
|Memory||32GB G.Skill FlareX 3200c14|
|Video Card(s)||PowerColor Radeon 6900XT Liquid Devil Ultimate, UV@950mV/2050MHz/180W|
|Storage||2TB Adata SX8200 Pro|
|Display(s)||Dell U2711 main, AOC 24P2C secondary|
|Audio Device(s)||Optoma Nuforce μDAC 3|
|Power Supply||Corsair SF750 Platinum|
|Keyboard||Cooler Master MasterKeys Pro M w/DSA profile caps|
|Software||Windows 10 Pro|
It's entirely possible that their consumer and enterprise departments have different standards or methods for noise testing. Unless they publish their methodologies, there is no way of knowing. I would expect any serious company to test in at least a semi-anechoic chamber, which tends to mean a ~15dB noise floor. I would also expect them to test the drives either mounted in a foam block or suspended somehow - i.e. a best case scenario. But there are many ways in which testing can differ from (other testing that gets put into) spec sheets:Well, you're right.
Don't you think specs of same company can make some sense. specially when they're on the same page of the same pdf in the same product series?
Or WD says our 5k blue idles at 23 and our 7k Ultrastar 18tb idles at 20 (basically all helium from WD idle at 20). Could it be the other way around in test? Still waiting for @Xeon to answer
- directionality: Especially high frequency noise like motor noise will be highly directional and will thus differ greatly depending on the orientation of the drive and the relative orientation of the measurement device
- resonance: even assuming a well dampened room, sound will resonate. A drive sitting on a table will sound different from one sitting on a cardboard box, which will again sound different from one hard mounted in a case, which will sound different from one mounted in a case with dampening. And the case material, thickness and construction matters a lot too.
- sound pressure is (largely) additive, meaning the more noise you have, the more noise you'll measure. The specifics of the interplay between sound waves in a material are way beyond my understanding, but on a pre-school level it's as simple as sound being energy; more sound = more energy. So, adding a 26dBA sound source (at a given distance etc.) to a 26dBA room will (roughly) result in a 3dBA noise increase, as you're doubling the sound energy present - assuming the frequency spectrums are matched. But the log scale of dB/dBA confuses this - so adding a 26dBA sound source to a 30dBA room will only result in a less than 1.5dBA increase in overall sound pressure. But this also means that your noise floor will impact your readings. Even the quietest fan or HDD will be measurable in a normal "quiet" ~30-36dBA room, as long as you're close enough - it still transfers energy to the air, after all! - but the readings will also be higher than if the room was quieter.
And so on and so on. Meaningful, useful and comparable sound measurements are hard.