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Defrag.exe is a command line tool included with Windows, which is quite useful when wanting to perform a scheduled defragmentation of the hard disk. There are several command line switches available when running the tool:

• Show available command line switches:

  defrag -?

• Analysis of the partition to discover fragmentation level:

  defrag c: -a

• Force defragmentation of the partition (Even if not having 15% free space available):

  defrag c: -f

• Defragmentation of only the boot files on the partition:

  defrag c: -b

• Display verbose information during defragmentation:

  defrag c: -v

• Pause the defrag when the computer is not in idle state (Vista+):

  defrag c: -i

• Complete defragmenation that includes all partitions (Vista+):

  defrag -c

• Defrag all files independent of size. Performs by default a partial defragmentation excluding files larger than 64 MByte. (Vista+):

  defrag c: -w

Related Logical Prefetcher helps defrag to optimize file layout
Related Repair the builtin disk defragmenter
Related Different defragmentation utilities available

More Info MS KB Q283080
More Info Microsoft Windows XP - Defrag

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