Running Disk Defragmenter from Command PromptAdvanced users can use the command line tool Defrag.exe to generate detailed reports and perform other advanced tasks. To run Disk Defragmenter from a Command Prompt, follow these steps:
- From the Windows Vista default Start menu, click All Programs, Accessories, right-click Command Prompt, and then select Run as administrator.
- In the User Account Control dialog box, click Continue.
- In the command prompt, type the appropriate command. The following command line switches are available for Defrag.exe:
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 help information. |
Examples of use:
defrag d:
defrag d:\vol\mountpoint -w -f
defrag d: -a -v
defrag -c -v
