FATMon is not a repair tool, it a monitor of the File Allocation Table ( FAT - FAT32 ). It tells you when it maybe starting to become damaged; so you have time to run Scandisk to repair, it before it is too late.
FATMon is the only utility available today that can monitor the File Allocation Table and your System resources while you work in Windows. You can do your work without effecting FATMon and without FATMon effecting your work. It will not slow your computer down or hog your CPU.