O&O Defrag Professional 20.5.603 Full Version is an advanced automated defragmentation tool to optimizes and increases your computer performance. O&O Defrag is an advanced defragmentation tool that allows to perform maintenance on your hard drives both hard disk drive (HDD), as well as solid state drive (SSD). This program helps you to get the maximum speed of your computer by maintaining and defragmenting all sectors on your hard disk.