You cannot defragment file system volumes that are not NTFS, FAT or FAT32. For more information about chkdsk and fsutil dirty, see Additional references. You can determine if a volume is dirty by using the fsutil dirty query command. You must run chkdsk on a dirty volume before you can defragment it. You cannot defragment volumes that the file system has marked as dirty, which indicates possible corruption. You cannot defragment volumes that the file system has locked. You cannot defragment specific types of file system volumes or drives: Perform free space consolidation on the specified volumes.

Print verbose output containing the fragmentation statistics. Print the progress of the operation on the screen. Track an operation already in progress on the specified volume. Run the operation on each volume in parallel in the background. Run the operation at normal priority (default is low).

Perform the operation on all volumes except those specified. Perform analysis on the specified volumes. Specifies the drive letter or mount point path of the volume to be defragmented or analyzed. Syntax defrag | /C | /E ]ĭefrag | /C | /E /A ]ĭefrag | /C | /E /X ] Membership in the local Administrators group, or equivalent, is the minimum required to run this command.įor examples of how this command can be used, see Examples. Locates and consolidates fragmented files on local volumes to improve system performance. Applies To: Windows Vista, Windows Server 2008, Windows Server 2012, Windows 8

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