This utility uses the following syntax:
defrag
-a [-v]
defrag [{-r | -w}] [-f] [-v]
defrag -c [{-r | -w}] [-f] [-v]
The following list describes each of the command line arguments.
volume
Specifies the drive letter or mount point to defragment.
-a
Performs only an analysis of the drive. The analysis tells you whether the drive requires
defragmentation, but doesn??™t actually perform the task. The output information includes the
fragmentation percentage, which you can use as an indicator of drive condition. Don??™t use this
command line option when you want to automate the defragmentation process.
-f
Forces a defragmentation, even if the drive or mount point free space is low. Normally, the
Defrag utility requires 15 percent free space to perform a complete defragmentation. Using this
command line switch lets you perform a partial defragmentation when the free space is less than
optimal.
-v
Displays additional information about the defragmentation process.
-r
Performs a partial defragmentation, which runs faster, but doesn??™t assure the hard drive
will run at peak efficiency. Defrag only consolidates fragments smaller than 64 MB.
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