|/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.|Likewise, the following switches are dropped in Windows 7. 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.
|/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.|