To the average computer user, the file on their disc is a single entity. Its just a.. thing.. you open it, you close it, you work on it and you save it and thats it. its very much like a paperback book. No frills and nothing to worry about. Whoops.. guess what.. That file is rather like a paperback book, but not for the reasons that you think. It has individual pages and the computer has to ke... more.