How Defraggler defragments free space

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

The Freespace Fragmentation Problem:

Your hard drive's free space will become fragmented over time as Windows writes, modifies, and deletes files. Eventually, the available drive space will not be located in a single contiguous block, but will be scattered in small fragments across the drive.

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.

Benefits of Free Space Defragmentation:

By defragmenting freespace on your hard drive, you may notice improved file system performance whenever Windows writes new files. This process will also help prevent new files from being fragmented in the future, to some extent.

How Defraggler Defragments Free Space:

Defraggler moves files or large file fragments in order to create a single continuous block of free clusters. It starts from the beginning of the drive, filling empty blocks with file clusters taken from locations later on the drive.

Defraggler has two options for defragmenting freespace:

  1. Normal mode: Defraggler only moves whole files to fill the free blocks. This mode minimizes the possibility of file fragmentation.
  2. 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 is more efficient than the normal mode, but it may cause additional fragmentation.
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