@AdrianMan: Thanks, I received and sent answer in e-mail. Posting also here as it may help other users as well:
Thanks for the Hard Disk Sentinel report !
Yes, now I see the problem: the current driver for the Intel RAID controller is a bit old, its version is 8.9 which does not allow accessing the proper hard disk status.
The proper Intel RAID controller support is added in later versions of the Intel RAID driver. If you open Support -> Driver Zone section at www.hdsentinel.com (directly at http://www.hdsentinel.com/driverzone.php )
you may find recommended Intel RAID controller drivers there, which work correctly.
For this system, I’d recommend using the driver version 10.5, available from that page (or directly from http://www.hdsentinel.com/driver/stor_allos_10.5.0.1026_pc.zip )
After installing this driver and restart of the system, complete hard disk status should be displayed. I’d suggest to use Report -> Send test report to developer option again after that, so I can check the situation and verify if the status will be better and advise if some information is still not displayed.
I agree that the current version may provide some information (in the other tool) - but I suspect it may be not really accurate or partial only, this is why not displayed in Hard Disk Sentinel.