Command: defrag

  DEFRAG optimizes file loading times from a disk by moving file 
  fragments together.

Syntax:

  defrag [/C] [drive] [{/F|/U|/DF|/FF|/FD}] [/Sorder[-]] [/B] [/X] [/A]
         [/FO] [/?]
         drive  This is the drive letter of the drive you wish to 
                defragment. For instance: defrag c:

Options:

  /C   Use command line version only. Defrag will not use its 
       menu-driven user interface if you use this option. It will 
       communicate through the command line instead.
       You must use the [drive] option, as described above, 
       when you use the /C switch, e.g. defrag /c c:
  /F   Fully optimizes specified drive. With this option, defrag will
       perform a full optimization by making sure that all files are
       at the beginning of the disk, with no gaps in between.
  /U   With this option, defrag will unfragment the files, but 
       gaps may be left between files.
  /FF  Fully optimized the drive, moving all files first.
  /DF  Fully optimized the drive, moving all directories first.
  /FD  Fully optimized the drive, moving all files of the same directory
       together.
  /S   Sort files by specified order.
       order: N  by Name (alphabetic)
              E  by Extension (alphabetic)
              D  by Date and time (earliest first) 
              S  by Size (smallest first)
              -  suffix to sort in descending order.
  /B   Reboots the computer after the optimization.
  /X   Forces defrag to exit as soon as it completes the optimization.
  /A   For use with the /C option, defrag will give an audible warning 
       before taking action.
  /FO  For use with the /C option, this tells defrag to give a more full
       output of information.
  /?   Shows the help.

Comments:

  Type DEFRAG /no-ops for a list of no-ops (/SKIPHIGH, /LCD, /BW, /GO).
  Type DEFRAG /contrib for a list of contributors.
  It is recommended to use DEFRAG with the user interface (not: /C).
  What is disk fragmentation?
  When files are deleted, or made smaller, this leaves gaps in the data 
  stored on the disk. If a file is created, or increases in size, it will 
  go in the gaps, but if this space isn't big enough, the file will be 
  continued elsewhere on the disk. After many such operations the file
  data can become very scattered. This fragmentation process slows down
  file access. Fragmentation is a normal process on DOS disks.

  When should I use defrag?
  Use defrag occasionally, or after installation of larger programs or
  after the creation of many (small) files.
  DEFRAG has the following EXITCODES (ERRORLEVEL):
    0  success
    1  internal error
    2  disk too full to defrag
    3  aborted by user
    4  general error
    5  read error
    6  write error
    7  FAT allocation error
    8  memory error
    9  out of memory

Examples:

  defrag c: /F

Command: defrag

Syntax:

Options:

Comments:

Examples:

See also: