Mold or Mildew?

We have been remodeling the basement so that we could make a TV area and maybe some extra space for the family to relax and for the kids to play. We were wondering how to tell the difference between regular "basement smell" and a possible mold problem. We have not seen any black mold yet, but we are keeping an eye out as we go.

This is my parents' basement, but I mentioned before that our basement at home flooded before. That same company, waterrestoration911.com, does black mold removal too. I am going to keep them in mind in case we find any black mold....ick I hope we do not find any. Theirs is a walk out basement though, so I think they get better air flow than most basements.

I am going to have to do some more research. These days there are so many more scary things to worry about, mold, radon, Carbon monoxide ( I think that is the bad one? LOL) I am glad there are companies that help you deal with these problems.