Defrag Command line switches in Windows
To begin, open an elevated command prompt window. Type Defrag /? and hit Enter. This will show you all the defragmentation options and command-line switches.
Here is the list of Defrag switches: Value Description /A Perform analysis on the specified volumes. /C Perform the operation on all volumes. /D Perform traditional defrag (this is the default). /E Perform the operation on all volumes except those specified. /H Run the operation at normal priority (default is low). /K Perform slab consolidation on the specified volumes. /L Perform retrim on the specified volumes. /M Run the operation on each volume in parallel in the background. /O Perform the proper optimization for each media type. /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. So, if you open cmd and type in “defrag /C /H /M” it will run defrag on all volumes, at a higher priority, in parallel. You might also want to check out some of the best free defragmentation software for Windows.
