A:Answer The capacity is 128, but the system takes up some space for managing the disk format. You can see the same effect on your hard drive. Imagine a book stand.... You could picture having lots of book stuffed on it, but when you put shelves on it, in some way, the shelves themselves take up some physical space from the books in order to organize them so you would end up with less books. That's what the format does... It allocates (prepares the disk with) logical indexes for your files.
Hope I could help.
