Volumes that the file system has locked.Some file system volumes or drives cannot be defragmented: Traditional defrag ( /D) is performed only on the Capacity tier. When working defrag will display a blinking cursor. To run Defrag, you must be a member of the Administrators group on the local computer, or have been delegated the appropriate authority. Supported file systems: NTFS, ReFS, Fat or Fat32. defrag uses this space as a sorting area for file fragments. Deleting prefetch files will make the machine boot more slowly so this is not recommended.Ī volume must have at least 15% free space for defrag to completely and adequately defragment it. V Print verbose output containing the fragmentation statistics.ĭefrag has an undocumented option /b (boot optimisation) which will clear out the Windows\Prefetch directory. U Print the progress of the operation on the screen. M Run the operation on each volume in parallel in the background.Īt most n threads optimize the storage tiers in parallel. L Perform retrim on the specified volumes. K Perform slab consolidation on the specified volumes. I n Run Tier optimization for at most n seconds on each volume. H Run the operation at normal priority (default is low). G Optimize the storage tiers on the specified volumes. E volume_name(s) Perform the operation on all volumes Except those specified. To specify multiple volumes separate the names with spaces. Volume The drive letter or mount point path of the volume(s) to be defragmented or analyzed. Track an operation already in progress on a volume: Perform the proper optimization for each media type:
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