Sometimes different (even newer) drivers do not work as should
Please try to update Hard Disk Sentinel to version 4.00 (by using automatic update from File menu). It may help immediately.
If things are the same, please try the following:
1) close HDSentinel (if running)
2) please click on Start -> Search in Windows 7 and enter CMD.EXE
then right click on the displayed CMD.EXE and select "Run as administrator".
3) Navigate to the folder of the software by entering
CD "\Program Files (x86)\Hard Disk Sentinel"
and then enter
HDSentinel.exe /REPORT /ENABLETEST /RAID
this should start the software but also save a
HDSentinel_4.000 PRO_report.txt , a testmode.txt and RAID.TXT file to the folder of the software.
Please send me those files in e-mail as they dump all response between the communication
of the hard disks and the software. These files may help to check what the JMB36X controller respond
when the first hard disk is accessed.
Ps. I sent this in e-mail also in response to your report.