Defrag Options & Command line switches in Windows 10/8/7

The Disk Defragmenter in Windows 10/8/7 offers some additional options compared to that in Windows Vista. Its command line version has some additional switches. Open an elevated command prompt windows.

Defrag Command line switches

Type Defrag /? and hit Enter. This will show you all the defragmentation options and command line switches.

cmd defrag

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.

Download this VPN to secure all your Windows devices and browse anonymously
Posted by on , in Category Windows with Tags
Anand Khanse is the Admin of TheWindowsClub.com, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.