Apple Hardware Test Question on iMac

I did an advanced Apple Hardware test on my 09 iMac today to test it and to see what was making the buzzing sound. The advanced test revved up each fan when it tested the logic board and I can say it is the lower left fan making the buzzing, however once it reaches 2000+ RPM the buzzing goes away.
The question i want to ask is after the test the optical drive fan stayed revved up at over 2000 RPM for a few minutes after the computer restarted, unlike the other two fans that went back to normal this fan took atleast 3 mins to go back down to normal rpms. Is this normal?
Thanks
Also does the HDD run when in a hardware test? as now and then during the test I heard a weird static sound coming from the HDD.

I looked at iStat after restarting from the test and it showed that only the optical drive fan was running at high speed after the test, with the slight buzzing fan still buzzing at low speed. I could hear that the optical drive fan was slowly revving down getting slower and slower, iStat showed it was as well and now its back to normal rpm and not revved anymore. I just thought all fans would return to normal after the test unless the optical drive got hot during the test.
The buzz is not too bad and is only noticeable in a quite room but I'm more concerned about the random grind/static sound the HDD is making ever so often. The sound is very quiet but can still be heard but i don't know what it is, well I know its not the sound of a HDD breaking as I know what that hears like.

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