Allow fragmentation mode: If Defraggler does not find any files that will fit completely into the free block, it will move file fragments instead.This mode minimizes the possibility of file fragmentation. Normal mode: Defraggler only moves whole files to fill the free blocks.Defraggler has two options for defragmenting freespace: It starts from the beginning of the drive, filling empty blocks with file clusters taken from locations later on the drive. How Defraggler Defragments Free Space:ĭefraggler moves files or large file fragments in order to create a single continuous block of free clusters. This process will also help prevent new files from being fragmented in the future, to some extent. Benefits of Free Space Defragmentation:īy defragmenting freespace on your hard drive, you may notice improved file system performance whenever Windows writes new files. This causes further file fragmentation, since Windows must write new files as fragments in order to fit them into the available ranges of free clusters. Eventually, the available drive space will not be located in a single contiguous block, but will be scattered in small fragments across the drive.

Your hard drive's free space will become fragmented over time as Windows writes, modifies, and deletes files.

NOTE: For the procedure to defragment free space, see this topic.

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