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[ndog02]

I did a quick search on the forum and didn't see anything applicable so far.  Got my DNS-321 setup for the first time last night, and it makes a high pitch electronic-type noise whenever the power is on.  It does this even when there's no drive installed, it started the second I plugged it in even before installing the drive.  Anyone experience a similar problem?

Thanks! 

[JavaLawyer]

I did a quick search on the forum and didn't see anything applicable so far.  Got my DNS-321 setup for the first time last night, and it makes a high pitch electronic-type noise whenever the power is on.  It does this even when there's no drive installed, it started the second I plugged it in even before installing the drive.  Anyone experience a similar problem?

Thanks! 

Can you discern whether the noise is the fan?  The most likely source are moving parts -- so you should try to rule out the fan first.

[jamieburchell]

My betting is the power supply brick. Especially if you hear it when the NAS is off.

[ndog02]

Can you discern whether the noise is the fan?  The most likely source are moving parts -- so you should try to rule out the fan first.

Definitely not the fan.  The fan is off, and its still making the high pitched noise.  If I turn it off by holding the button, the box powers down, and the noise stops.  When I turn it back on, the noise starts immediately.  The fan will then run for ~20 seconds, then shut off (I only have one drive, so it's not getting too hot). 

[ndog02]

My betting is the power supply brick. Especially if you hear it when the NAS is off.

When the NAS is off, no noise.  I also moved the power brick as far as I could from the NAS to be sure I'm not confusing where the noise is from, definitely coming from the NAS and not the brick. 

When I turn the NAS back on, the noise is back.  Temp is ~ 40 degC, so it's not too hot either.

[JavaLawyer]

So, said there's one drive installed -- if you remove the HDD, the noise persists?

[ndog02]

So, said there's one drive installed -- if you remove the HDD, the noise persists?

I left the NAS off overnight, removed the drive this morning before powering on, and then turned it on.  Initially no noise, then the high-pitched sound came back after the NAS was on for a minute or two.  So it's definitely not the drive, or power brick.  Are there any other moving parts in there?

[ndog02]

So it's definitely something with the ethernet connection.  When I unplug the cat5 cable, the noise goes away.  Plug it back in, the noise starts out soft and ramps back up to the high pitched sound. 

[JavaLawyer]

To err on the side of caution, I suggest you get a replacement DNS from the retailer where you made the purchase or an RMA through D'Link.