O&O Defrag 21 Product manual

O&O Defrag 21 
Supported File Systems

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O&O Defrag supports all Windows file systems. The following paragraphs will tell you more about each of these file systems.

File System Explanation
exFAT Starting from Windows Vista, the exFAT-file system is supported. This was designed especially by Microsoft in regard to flash drives, and delivers better performance than FAT. It is also much better against structural damage to the file system and protected against data loss.
FAT FAT is the oldest data system, the roots of which go back to MS DOS. It is supported by Windows. O&O Defrag can be used without any problem on FAT drives.
FAT32 FAT32 is the native file system of Windows 95b/98/Me. It offers some advantages compared to the older FAT. FAT32 drives are Windows- supported by default and can be defragmented without any problem using O&O Defrag.
NTFS The NT file system was developed completely new for the Windows NT family. It offers the option of security restrictions on the file level, increases the security against data errors, and achieves higher performance.It is supported by Windows. And O&O Defrag gets optimal results when defragmenting NTFS drives.
EFS A file system introduced with Windows 2000 which is based on NTFS and its encryption ensures higher data security against abuse or unauthorized access. The Encrypted File System (EFS) makes data for unauthorized users unreadable. O&O Defrag supports EFS hard disks; neither data integrity nor data security is compromized.