Short description of O&O Defrag 11 Pro 11.5: The new O& O Defrag 11 Professional Edition activates the hidden performance of your computer. O& O Defrag optimizes your hard disk and effectively and securely packs file fragments back together. O& O Defrag 11 includes an array of functions that a really good defragmentation software should offer, ranging from a fully automated defragmentation function to an expert setting option.