text: how do you build a home-made clean room? i'm trying to repair some sensitive equipment (hard drive) and want to do it in the cleanest environment possible...  the companies that do this kind of work (data recovery) operate in class 100 clean rooms... how do i make my own "clean room" that's suitable for this kind of work? why would you waste your time repairing a hard drive when you can purchase a new drive for next to nothing...sounds like a horrible waste of time and effort.