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shrink

The Diskpart shrink command reduces the size of the selected volume by the amount you specify. Windows commands reference

On Windows

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Windows

from the Windows commands reference, CC BY 4.0

The Diskpart shrink command reduces the size of the selected volume by the amount you specify. This command makes free disk space available from the unused space at the end of the volume. A volume must be selected for this operation to succeed. Use the select volume command to select a volume and shift the focus to it. NOTE: This command works on basic volumes, and on simple or spanned dynamic volumes. It doesn't work on original equipment manufacturer (OEM) partitions, Extensible Firmware Interface (EFI) system partitions, or recovery partitions.

shrink [desired=<n>] [minimum=<n>] [nowait] [noerr]
shrink querymax [noerr]

To reduce the size of the selected volume by the largest possible amount between 250 and 500 megabytes, type

shrink desired=500 minimum=250Identify

To display the maximum number of MB that the volume can be reduced by, type

shrink querymaxIdentify
desired=<n>Specifies the desired amount of space in megabytes (MB) to reduce the size of the volume by.
minimum=<n>Specifies the minimum amount of space in MB to reduce the size of the volume by.
querymaxReturns the maximum amount of space in MB by which the volume can be reduced. This value may change if applications are currently accessing the volume.
nowaitForces the command to return immediately while the shrink process is still in progress.
noerrFor scripting only. When an error is encountered, DiskPart continues to process commands as if the error did not occur. Without this parameter, an error causes DiskPart to exit with an error code.