It’s not an intentional noise, it’ll be a shitty bridge rectifier.
It’s just a cheap shitty power supply.
this post was submitted on 10 Jan 2024
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What's a bridge rectifier?
The power supply is "universal" (comes with different attachments for different regions' outlets), so I could see it doing something weird like that.
But it only happens when it's plugged into the outlet, but the HDD is NOT plugged into the computer.
Could it be expecting some extra power from the PC or something?
No, it’s nothing to worry about, it’ll be just a handful of super cheap parts in the power supply. Essentially when the power supply converts ac to dc, it has a bunch of standard parts, and if you cheap out on them, sometimes they make high pitched noises. The noises can vary in pitch too.
It's not the bridge rectifier, but it's an artifact of the operation of the switchmode power supply. Similar effects are often described as 'coil whine '.
The switching operation varies in duty cycle and frequency depending on load, and isn't absolutely stable so oscillates a little bit. This switching supply is often in the audio range; typically between about 5kHz and 200kHz depending on design and load.
Changing current and magnetic field causes the physical components (particularly transformers/inductors) to change size and shape, and this vibration causes audible noise. At some conditions, it will resonate at an audible frequency and be loud. At other conditions, it might not resonate and/or the frequency is outside the audible range, so it's silent.
Mains transformers do the same, causing the characteristic 50/60Hz hum. You'll also hear the same out of cellphone chargers.
Nothing to worry about.
Thank you for that! I've gotten into the habit of unplugging both cables (power + data) when I'm done with it, which is probably better anyways...but at least now I don't have to fret if I forget one.
(Always safely ejecting, of course!)
Thanks!
Can you record the sound? I've never heard of a power supply having any kind of noisemaker. It's probably just electrical interference or coil whine or something, where the waveform happens to produce that periodic sound. (You might even look around and find a nearby device changing its power draw with the same periodicity.)
Yeah, interesting. I'll see if I can record it tomorrow!
Haven't been able to record it yet, but the sound only happens when the power supply is plugged into the HDD and the outlet (not one or the other), and the HDD is NOT plugged into the computer.
Plugging the HDD into the computer stops the sound. I was unplugging it from the PC to keep it offline when I didn't need it. (After safely ejecting and waiting etc. of course)
I guess I'll just need to unplug the power when I'm not using it, too.
It's probably just coil whine.
You say the sound comes from the power supply and the HDD is not plugged into the computer. My diagnistic: the power-supply makes a noise when it operates at very low load (almost 0mA of current), it is probaly making the cyclic noise because of some blinking LED or another very small variation of the loaf somewhere. This is a very common symptom of cheap power-supplies, but it doesn't necessarly mean it isn't working normally, just an annoyance.
It's weird -- the sound happens when the power supply is plugged into the outlet and the HDD, but it turns off when the HDD is plugged into the PC.
I could look for a blinking LED, but it really does sound like a noise maker rather than something electrical. But I'm not an expert.
I suppose, when you plug the HDD to the computer, it spins up and start drawing more current from the power-supply and the noise disapears. This is because the PSU has a buck-converter, the switching frequency increase proportionally with the current drawn by the load. When the current it almost 0mA, the switching frequency can be audible (electromagnetic forces can make some components vibrate, e.g: coils). When the current is nominal, the frequency will be ultrasound and you won't hear it. I have observed this with many electronic devices. If you are worried, you can try another power-supply, after checking it has the same voltage and polarity on the plug, and can deliver at least as much current as the original one.
Thank you for the reassurance. I guess I'll just either let it be noisy or leave it fully unplugged when not in use.
First world problems... having to choose between barely audible noise, or having to plug TWO things in to access my 14TB, lmao
My monitor status LED makes a faint beeping sound when in standby.
Also the panel makes an audible whine when the content changes to a specific amount of white.
As another user already said: Probably low quality electronics.
I've come across it once with a laptop power supply. I believe it correlated to a voltage issue of some sort. We just replaced it with a new one and the problems disappeared. It definitely wasn't coil whine, but I didn't believe the person complaining about it until I held it up to my head myself.
Was it like a little tiny weewoo alarm? Because that's all I can describe it as, Lmao
Check the SMART data with crystaldiskinfo
Will do, thanks. Did lots of thorough checks when I got it, so I didn't expect there to be any issues now.
HDDs can fail at any time, with or without warning.