Diskeeper:

Diskeeper is one of the most popular software among enterprises. The product starts at $29.95 and is also considered to be as one of the most formidable products out in the enterprise market. Since the establishment way long back, the product still delivers strong and same reliability and performance. A main feature in this software is that the product silently sorts files whenever the computer is kept idle. Users can freely download the trial version from its website.

Defraggler:

And finally here is the world favorite, Defraggler from Piriform Software. The software is extremely lightweight and never impacts the system performance. The Defraggler also can defrag individual files apart from whole disks and partitions. There is a free version of Defraggler with basic functionalities, additional features are available in Pro ($24.95) and Business ($34.95) versions.

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