mst Defrag is worldwide the first proactive defragmentation software. mst Defrag works completely in the background and does not interrupt or disturb the work of users. You will have the maximum performance everytime, not only just after the defragmentation. mst Defrag is the only solution to eliminate performance bottlenecks and stability problems directly at their beginning. You buy with the Home Edition the legitimacy to use the software on a solely private used computer.