diff -r 07a6126a4796 -r 600962f8a298 Hardware/HDD/AbstractHarddrive.cs
--- a/Hardware/HDD/AbstractHarddrive.cs	Mon Feb 13 21:56:29 2012 +0000
+++ b/Hardware/HDD/AbstractHarddrive.cs	Tue Feb 14 23:07:55 2012 +0000
@@ -179,8 +179,8 @@
 
         if (!sensorTypeAndChannels.Contains(pair)) {
           Sensor sensor = new Sensor(attribute.Name, 
-            attribute.SensorChannel, attribute.SensorType.Value, this, 
-            settings);
+            attribute.SensorChannel, attribute.DefaultHiddenSensor, 
+            attribute.SensorType.Value, this, null, settings);
 
           sensors.Add(attribute, sensor);
           ActivateSensor(sensor);