davo,
pardon me for my word.
I did a thorough and fu**king search and I could not find the answer. If I've got the answer, I will not open a thread over here.
No raid configuration involved. Not even RAID 0.
Question is:
Hard disk error.
I replace new hard disk (hard disk 2) into the same slot. Hard disk is using same brand, same size and same model.
I could not do anything even to format it.
Existing configuration, both hard disk work independent. No raid involved. As you can see in the screenshot attached.
Thanks anyway.