Fan

The Kurobox/KuroboxHG, LS1, LS2, LS-HG and LS-HS cases have a built in 40mm fan, which can run at variable speeds controlled through the microcontroller. In this case the LS or Kurobox has two fan speed presets-- slow or fast.

The fan used in all of these is a ADDA AD0412LX-G76 which measures 40mm x 40mm x 10mm. By looking at the model number, we can extract it's information:

Source: ADDA Model Numbering Scheme

Fan Control
There are some fan control scripts which will automatically set the fan speedbased on the current temperature of the Hard Drive. You can also manually set the speed from the Linux console.

Fast speed: Slow speed:
 * 1) /bin/echo -n ']]]]' > /dev/ttyS1
 * 1) /bin/echo -n '\\\\' > /dev/ttyS1

Replacement
Kurouto Shikou in Japan sells a replacement parts kit which includes a replacement fan, however, you should be able to replace it with another fan with the same physical dimensions. If you decide to go this route, you will need to make physical modifications to the wire leads from the fan.

Also by:
 * Vendor: Mouser Electronics, Part Number: AD0412LX-G76-LF, Website: http://www.mouser.com . Update.  Mouser has an excellent searchable parts database.  If this part is discontinued, simply search for any 40mm x 40mm x 10mm,  12VCD fan, with a CFM rating of around 5 to 8 (cubic feet per minute).


 * Silenx.com, Part Number: IXP-11-14 , iXtrema Pro Series Quiet Fan.  I used this to replace the fan on a salvage-grade LS2 that I received, and it fit pretty well.  It is nearly silent.  The only dodgy bit was that the wires were not color coded as on the LS2's original unit, so a few minutes of trial and error were necessary to get the correct connection scheme. Davygravy  The pinout (when the wires are closest to you) is: top=sense, middle=ground, bottom=positive discojohnson

Failure
I have two Buffalo Linkstations which also use this model of fan. Both units suffered fan failure with two months of each other. This occurred after a total period of deployment of approximately 20 months each of always on usage. Ambient temperatures never rose above 23C and the units were only lightly loaded during the whole period. At all times case temperatures remained sensibly low. The extended life claims from ADDA about their HYPRO bearing design were not evident from these two sample units.