After I routinely upgraded to version 4.38 this morning from the prior beta, I kept hearing the normal sensor-initiation chirps long after I had started the program--about three-to-five per minute. This click-chirp sound is very similar--if not identical--to what I had experienced with SpeedFan several years ago.
Reverting to 4.36 2150 (just a recent earlier version) completely eliminated the persistent sounds coming from my Dell M6600 workstation (laptop), which has both an SSD and standard hard drive. (Hardware has not changed in years.)
I commend you for the considerable improvements with HWinfo fan control. My four temperature readings for the CPU are typically in the mid-to-high 40 degree C range, sometimes dropping into the high 30-degree C range after inactivity.
FYI: Intel i7-2820QM CPU @ 2.30 GHz; 16 GB RAM; 04YY4M motherboard; AMD Radeon HD6900M video adapter; LITEONIT LAT-128M2S; ST9320423AS hard drive
This is more of a nitpick than a true bug. Thanks for your attention, Martin.