Below Screen1 - Overall shot, no highlight. I'll use the highlight to bring up each graph counter, since they are sometimes hard to read because simultaneous value movements covering each other. The graph spikes here representing 4 consequent HDD "clicks"...

Screen 1 - Overall

Below Screen 2 - %Disk Read Time /highlighted white/
The activity here shows only small read percentage...

Screen 2 - Read

Below Screen 3 - Disk Write Time /white highlight/
Here is is CLEARLY visible what happens during clicking in the disk....

Screen 3 - Write

Below Screen 4- Average Disk Bytes/Transfer /highlighted white/
As seen on the graph, the amount of data written doesn't exactly corresponds with the time spent during writes to the drive.

Screen 4 - Avg Byte Transfer

Below Screen 5 - Queue Length /highlight/
Here is about write+read alltogether, a good match to the click.

Screen 5 - Disk Queue

Below Screen 6 - Processor Time
CPU is inactive mostly, but during the 2 biggest spikes it's completely down, no activity.

Screen 6

Conclusion

In about 75%of time the sound is represented by the above captured HDD activity. But , there are those remaining 25% when drive clicks, and there is zero data movement.....

Anyone knows why is the drive clicking-clunking ?

Let me know if you do.

Thanks
Dave