add index

I there's this "add to index..." button on the explorer window. I clicked it while at the hard drive partition root directory, thinking it'll add my entire hard drive to be indexed. But afterwards, when I go into the search option in control panel, that hard drive is not in the list. Just for test, I did the same to another hard drive partition that was in the list, and it disappeared too. Is this a known bug? Anyway I can reset those hard drive's index options? I've go as far as rename, reletter, and reformat the drive. It seems the configuration is kept somewhere else. BTW, I am using open beta 2.