Disk Defragmenter overview
Disk Defragmenter analyzes local volumes and consolidates fragmented files and folders so that each occupies a single, contiguous space on the volume. As a result, your system can access files and folders and save new ones more efficiently. By consolidating your files and folders, Disk Defragmenter also consolidates a volume's free space, making it less likely that new files will be fragmented. The process of consolidating fragmented files and folders is called defragmentation.
The amount of time that defragmentation takes depends on several factors, including the size of the volume, the number and size of files on the volume, the amount of fragmentation, and the available local system resources. You can find all of the fragmented files and folders before defragmenting them by analyzing the volume first. You can then see how fragmented the volume is and decide whether you would benefit from defragmenting the volume.
