Thanks a lot for your feedback, Kataro . I wouldn't dare to conclude anything at this time, but so far I think I have solved the problem . I wonder it is my ICH9R controller got problem or the SATA port itself. What I did was move the Seagate 500GB HDD (system drive) from SATA port 0 to SATA port 2 and the Samsung 120GB HDD (backup drive) from SATA port 2 to SATA port 4. Voila ~ the read/write delay and HDD error already stop showing up .

I happen to do this when I tried to copy a set of files from My Document in my Seagate HDD to a backup folder in my Samsung HDD. That time the Seagate HDD still on SATA port 0 and my Samsung HDD on SATA port 2. During the copying process, the files like getting delay and stuck once a while. In the end, the system hang and I'll need to force reset the system and go through the bootup sequence problem like I mentioned in my first post. Tried to copy the files thrice and all also suffering system hang in the end. Then I will have those errors in my Event Viewer.

Then the next I switched to as I mentioned in this post, the Seagate HDD to SATA port 2 and Samsung HDD to SATA port 4. Till now I didn't receive any more error regarding HDD or bootup . It wasn't me alone with this problem, I tried googling (iastor error) and even some LYN forumer also experiencing the same. Weird case honestly...

I just tweaked my OCZ ram to 4-4-4-12 @ 2.0V and tested with memtest86+, no error encountered and passed all the test. Thanks god that my ram is safe and good to use

Yeah, problem consider solved at the moment... my platform rock solid now even after I overclocked it, but what makes me think now is regarding my mobo's SATA ports or ICH9R controller. It is faulty or it is just normal occurance since not I alone having problem with the iastor error . My motherboard is still new and I really doesn't anything flaw with it

Already informed my problem with one of the DFI bulker in the forum and thankfully he said he will forward my problem towards the DFI distributor technician

Could you describe more about your problem and also listing the specification and configuration of your system here?