Switch | Description |
/A | Perform analysis on the specified volumes. |
/C | Perform the operation on all volumes. |
/E | Perform the operation on all volumes except those specified. |
/H | Run the operation at normal priority (default is low). |
/M | Run the operation on each volume in parallel in the background. |
/T | Track an operation already in progress on the specified volume. |
/U | Print the progress of the operation on the screen. |
/V | Print verbose output containing the fragmentation statistics. |
/X | Perform free space consolidation on the specified volumes. |
Although the following switches are not listed when running "defrag.exe /?", Defrag.exe in Windows 7 still accepts these switches. It’s not clear if they’re left for backward compatibility. Perhaps we should wait for official note from Microsoft.
Switch | Description |
/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. |
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