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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 when displaying fragmentation statistics:

  defrag c: -v

New commands in Vista

• 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

New commands in Win7

• Defrag all drives except those specified. (Win7+):

  defrag c: /e

• Defrag using normal process priority, instead of low priority. (Win7+):

  defrag c: /h

• Defrag each volume in parallel in the background. (Win7+):

  defrag c: /m

• Defrag while printing progress information on the screen. (Win7+):

  defrag c: /u

• Defrag with focus on free space consolidation, so there is contiguous free space for new files. (Win7+):

  defrag c: /x

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

Credits MaximumPCGuides.com