First, I would like to thank natebarnz, obakesan , and cobain who left me comments and encouragements for safe data recovery. It means a lot to me. And the great news is that I can now connect to the Drobo again. It's currently in the rebuild/relayout process, but I can access the data. As matter of fact, I am copying some of the data off of it while the process is going. The copying is very slow at around 9MB/s, but it's going.
I want to thank god who answered my prayers. Somewhere out there, the higher power is watching over me. I am grateful.
Tomorrow I am going to buy a 2 TB drive and copy everything over from the Drobo. I don't feel safe having all the eggs in one basket.
So far everything is looking good.