Use of "defrag" within Windows

  • Article ID: 109226
  • Updated: 12 Jun 2012


Product
Sophos SafeGuard Disk Encryption 4.60

Client OS

Windows 2000 Professional SP4, Windows XP SP3

Server OS

None

Question

How and why to use "defrag" within Windows?

Answer

To prepare a system for a Sophos SafeGuard Disk Encryption installation, we recommend to use the Windows on-board tools "defrag" & "chkdsk" to obtain a clean file system.
A detailed description how to use "chkdsk" can be found in SGI 109277.


The Windows built-in "defrag" tool locates and consolidates fragmented boot files, data files, and folders on local volumes.
It should be used as follows:

Syntax

defrag volume

defrag volume [/a]

defrag volume [/a] [/v]

defrag volume [/v]

defrag volume [/f]


Parameters

volume : The drive letter or a mount point of the volume to be defragmented.

/a : Analyzes the volume and displays a summary of the analysis report.

/v : Displays the complete analysis and defragmentation reports.

When used in combination with /a, displays only the analysis report. When used alone, displays both the analysis and defragmentation reports.

/f : Forces defragmentation of the volume regardless of whether it needs to be defragmented.

/? : Displays help at the command prompt.

Remarks

-A volume must have at least 15% free space to be completely and adequately defragmented. Defrag uses this space as a sorting area for file fragments. If a volume has less than 15% free space, defrag will only partially defragment it. To increase the free space on a volume, delete unneeded files or move them to another disk.
-You cannot defragment volumes that the file system has marked as dirty, which indicates possible corruption. You must run chkdsk (see SGI 109277) on a dirty volume before you can defragment it. You can determine if a volume is dirty by using the "fsutil dirty" query command.
-While defrag is analyzing and defragmenting a volume, it displays a blinking cursor. When defrag is finished analyzing and defragmenting the volume, it displays the analysis report, the defragmentation report, or both reports, and then exits to the command prompt.
-By default, defrag displays a summary of both the analysis and defragmentation reports if you do not specify the /a or /v parameters.
-You can send the reports to a text file by typing >filename.txt, where filename.txt is a file name you specify. For example:

defrag volume /v >filename.txt

-To interrupt the defragmentation process, at the command line, press CTRL+C.
Related documents:
- 109277 Performing detailed check of the NTFS file system


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