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It's as robust and reliable as any defrag tool based on the Microsoft API, which is pretty much all of the competition, so it won't delete the wrong files or otherwise mess up your disks. JkDefrag is optimized for daily use and can be run automatically at startup or other times, and it can be used as a screensaver, too. The defragmentation process didn't seem to take significantly more or less time than other tools, though the program has some nice features, such as moving directories to the front of the disk and reclaiming MTF reserved space when the disk is full. Clicking the program's system tray icon called up a menu with basic controls, a key to the display's color coding, and a menu for selecting what you want it to do when it's finished with the current job. A compact view opened, displaying the program's progress in a color-coded bit map and counters. We selected what Actions we wanted JkDefrag to perform and which of our drives to check from drop-down menus and started the program. JkDefrag GUI opens with a compact properties dialog that serves as a primary control interface. JkDefrag is a free, open-source defragmentation utility JkDefrag GUI is a graphical user interface version that makes the powerful tool as easy to use as the built-in Windows feature and its many competitors.
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For about as long as there's been a Windows, developers have been targeting the disk defragmentation utility for improvement.
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