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Command line: Defrag
Description: Locates and consolidates fragmented files on local volumes to
improve system performance.

Syntax: defrag <volume> -a [-v]
defrag <volume> [{-r | -w}] [-f] [-v]
defrag -c [{-r | -w}] [-f] [-v]

 

Parameters:

Value Description
<volume> Specifies the drive letter or mount point path of the volume to
be defragmented or analyzed.
-c Defragments all volumes on this computer.
-a Performs fragmentation analysis only.
-r Performs partial defragmentation (default). Attempts to
consolidate only fragments smaller than 64 megabytes (MB).
-w Performs full defragmentation. Attempts to consolidate all file
fragments, regardless of their size.
-f Forces defragmentation of the volume when free space is low.
-v Specifies verbose mode. The defragmentation and analysis output
is more detailed.
-? Displays this help information.
Examples:
defrag d:
defrag d:\vol\mountpoint -w -f
defrag d: -a -v
defrag -c -v