PerfectDisk!

It differs from other defrag tools on the market, by enabling you to quickly and simply defrag the files you want to, without having to process the whole drive. You can defrag only if the computer is idle for a definable time, so Defraggler does not slow down the computer if you work on more important tasks. Defraggler also lets you defragment multiple drives on the same PC, using different schedules.Defraggler uses the Windows Task Scheduler to enable you to set it for future defragging. Simply tell it how often you want it to defrag a drive (once, daily, weekly or monthly). Then it will go ahead on its own, tirelessly defragging your computer whenever you need it to.You can defragment your main C: drive every night, and your external D: hard drive every week. It's up to you.Simply run it, select the file and defragment in seconds. No more struggling with the Windows defragmentation tool!An original portable version exists, but it is not easy to find: http://www.piriform.com/defraggler/download . »

UltraDefrag is powerful and fast defragmentation tool for Windows. There are three interfaces to them: graphical, console and native. The GUI is useful, because it represents your filesystem visually as a color-coded cluster map. The console is another option for those that prefer the command line. It allows you to run UltraDefrag from the task scheduler and scripts. Finally, the native executable will run at boot time in a manner similar to chkdsk. The design of UltraDefrag is very simple. There are no skins and other unnecessary stuff. It is a small and powerful program! »

O&O Defrag packs file fragments quickly and securely back together to optimize your hard disk under Windows. You can now see what the program does for your system thanks to graphics and statistics, which give you a before-and-after Defrag contrast. Its functionality ranges from a fully automated defragmentation to an individual professional set up. It can do everything a truly good defragmentation software should be able to do.The new background monitoring function helps to prevent fragmentation at source. Newly added and modified files are analyzed and defragmented whenever they are not being accessed. O&O Defrag makes sure that your hard disk is constantly performing at its peak. »

[Be careful during the installation: Forum ]

System Mechanic automatically repairs errors and fragmentation, cleans out clutter, and tunes up your PC -- so that it runs smoothly, reliably, and up to 300% faster! Don't waste money on expensive "experts" to fix your PC when System Mechanic will repair, tune, and maintain it for you!

WinContig is an easy-to-use stand-alone defragmentation tool that doesn't create any installation directories or Registry entries on your computer. Its purpose is to quick defrag files without the need to defrag the whole disk. In addition, WinContig allows you to group files into profiles, and also it accepts a number of optional command-line switches that you can use to control how the program operates.

Disk Defragmenter is a computer program included in Microsoft Windows designed to increase access speed by rearranging files stored on a disk to occupy contiguous storage locations, a technique commonly known as defragmenting. The purpose is to optimize the time it takes to read and write files to/from the disk by minimizing head travel time and maximizing the transfer rate. Disk Defragmenter is also used to improve system startup times.

Puran Defrag is a very simple disk defragmenter which will defrag the files and optimize your system, collecting all the fragments of a file and putting them together, as well as moving some frequently used files and all directories to faster disk areas. This process boosts your hard disk performance and thus overall system speed. In addition it reduces wear and tear on your hard disk, thereby increasing its life span.

Diskeeper 16 is a unique approach to Defrag, the effort of arranging files on the physical disk/media to improve speed and performance.

Vopt-fast disk defragmentation.Vopt lets you quickly defrag and pack your disk drives to maintain optimal performance and reliability. Vopt's speed makes daily defragging both practical and desirable. Vopt also provides tools to assist you in maintaining your system, reclaiming wasted disk space, and protecting your privacy.

DiskTuna is an easy to use, on-demand, no frills disk optimizer and defragmentation utility for FAT, FAT32 and NTFS formatted drives. Through a simple to use mechanism you can create ‘jobs’ that enable you to schedule or launch disk optimization with just one click. DiskTuna is freeware. DiskTuna reorganizes your disk and will make it faster and more responsive.

Ashampoo HDD Control 2 provides complete monitoring of your hard drive(s). The software supports not only all common IDE and serial ATA hard drive(s), but also provides improved support for external USB hard drives and solid state drives (SSDs).

Power Defragmenter is a very advanced GUI for Contig, which takes defragmentation process to a whole new level.