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[carodiavolo]

I have fan on max for long times during the day (and night).

The strange part is the temperature report in webpage:
   
Device Information
Workgroup   workgroup
Name    dlink
Description DNS-320
System Temperature 123°F/51°C
Current Rx/Tx   276004183/148966495
System Up Time   15 Day 8 Hours 20 Minutes

Drive Information
Right   SAMSUNG HD103UJ S13PJ1KQ903306 30°C / 86°F 1000 GB

Left   WDC WD10EARS-00Y5B1 WD-WCAV5S408024 37°C / 98°F 1000 GB

Doesn't seems so strange that the disks are cooler than the unit more than 15°C ?

[JavaLawyer]

All of the temperature readings are pulled from temperature sensors built into each HDD and the DNS-320. Hardware differences, including the sensor location and sensitivity will substantially impact the temperature readings.

Your particular DNS contains three sensors in products from three different manufacturers (D-Link, WD, Samsung). If your two HDDs were both the same make/model, I think you would find that the HDD temperatures would be substantially closer.

Rather than strictly looking at the absolute temperature of your DNS-320 (and HDDs), you should also pay attention to the relative temperature difference (e.g. how much the temperature fluctuates up or down), as this is a good indicator of potential airflow or ambient temperature issues.

[carodiavolo]

Many thanks... i will look at the temperature fluctuations...
but as far as i can remember i see them in a low range of fluctuation.

The odd part is that the fan is frequently on HIGH in the last 3 months. I cleaned all the case, fan and air passages (not so much dirt in them). I have the DNS 320 since august 2011 and here in Italy, August and September are so hot... seems strange to have the fan frequently on high in April and May... am I going to use DNS as air blower in August ?!?! 

Another unusual fact is that, if the fan is in high and I just click "SAVE SETTINGS" in
System Management>Power Management>Fan Control Settings the fan goes to Off for some times (15-20 min)... and then high again... 

[JavaLawyer]

In the web interface (Management > System Management > Power Management > Fan Control Settings), did you try adjusting the setting from Auto (Off/Low/High) to Auto (Low/High) or visa versa?

[carodiavolo]

Yes, I put in both modes, and the result is the same... fan on high...
As I said, the fan goes to slow or off just clicking on "save settings" without any change to the speed setting...