There are three Seagate disks installed. I have read of problems with HDD firmwares incompatibilities with whatever the internal BIOS is trying to read. If I read the temperatures from the S.M.A.R.T. tools, it reports a much more acurate temperature.
The question becomes, why does it say sensor 29 not installed during POST but then misread it during OS initialization?
And why, with all the many problems that have been reported about this, is there no option to disable reading it in BIOS? The wasted power draw from the fans running 78% all the time should have the green people sharpening pitchforks...