By now, there are so many disk defragmentation software to choose, like Diskeeper, Perfect Disk, Vopt, UltimateDefrag, and Defragmenter Pro etc. Every defragmentation program has its own feature, and during their unique selling proposition, the most mentioned is the fast speed of defragmentation. So today ColorMango recommend O&O Defrag, it’s not the fastest, the ColorMango team had a test and found that O&O Defrag performed a great defragment effect. O&O Defrag is designed for Windows. It is applied to various versions of workstations, servers and advanced servers, supports almost all the file systems, incls FAT16、FAT32、NTFS、NTFS5、EFS (Encrypted File System) etc. It can also automatically reconfigure the hard disk at a set time, and supports Chinese long file names, and has not many requirements on the hardware.