Defragmenting of hard drive is necessary part system maintenance of a computer. Defragmenting allows your hard drive to access files more quickly. All Windows version has inbuilt this feature by default. However, this feature is limited. If you want quicker performance, more features and detailed statistics, then use these free programs -
UltraDefrag is an open-source disk defragmenter for Windows with simple Interface. It completes the job quickly, reliably and achieves best possible results. It easily allows you to schedule defrag sessions when your system is idle. Also it runs in background when you are working.
UltraDefrag can defragment multiple partitions or drives in the same time. It is compatible with Windows NT 4.0, Windows 2000, Windows XP, Vista, Windows 7 & 8 with 32bit and 64bit.
Smart Defrag 3 is a FREE, light, and stable disk defragment tool designed for maximum hard drive performance. Smart Defrag works automatically and quietly in the background on your PC, keeping your hard disk running.
It also intelligently streamlines your files based on using frequency, thus accelerating disk speed for faster data access! With the unique Deep Analyze technology, it smartly clean junk files before defragmentation to save more disk space for you. Being the first Disk Defragmenter that fully supports Windows 8/8.1
Defraggler is free defrag software from Piriform.
It is easy to use, just click the drive you want to defragment, and then click the big Defrag button. If you want to save some time, there's also Quick Defrag option. In Defraggler you can specify one or more files, folders, or the whole drive to defragment. One of Defraggler's more advanced features is the ability to move large files to the end of the hard drive. It also shows you the interactive drive map of how the space on your hard drive is filled or empty.
MyDefrag is a powerful program which maybe better than the others with simple GUI. It starts up very fast and easy to use and very light. It Includes defined scheduling profiles on daily, monthly, weekly. MyDefrag also provides a defragmentation for USB Pen Drive, flash memory card and solid state drives.
MyDefrag is a disk defragmenter and optimizer for Windows 2000, 2003, XP, Vista, 2008, Win7, and for X64.
Auslogic DIsk Degfrag is little more than simple disk defragmentation. It quickly defragment files on your hard drive, optimize file placement and consolidate free space to ensure the highest data access speed possible. It also support single file or folder defragmentation, disk error check and repair. You can set the program to auto-defrag when PC is in idle state to keep fragmentation in check at all times.
When you run this program, it automatically detects hard drive partitions and quickly performed an analysis and displayed the results in a cluster map. Then select the drive you want to Defrag and then click Defrag button. The operation can be paused or stopped any time.