Defraggler is free product from Piriform, the same company that brought us CCleaner. Piriform has made yet, another excellent product in Defraggler. The program is very small, and defragments both FAT32 and NTFS partitions faster than the Windows Defragmenter. Defraggler also gives you the option to defragment individual files, instead of the entire drive. I would highly recommend using Defraggler!