[inf.]AddOn MyDefragPowerGUI Intl. MyDefragPowerGUI, that used to be known as JkDefragGUI, is a graphic user interface that has been specifically designed for MyDefrag, the powerful free defrag application. This application stand out because it offers the user an intuitive interface from which to access all the interesting features of MyDefrag, like defrag your hard drives when it detects that the computer isn't being used or the one that is called SpaceHogs, that moves the biggest and least u