Shrink disk or drive with diskpart

  # Manage Hard Drives, Partitions, and Volumes (DiskPart)

diskpart

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  # List the Disk

list disk

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  # Select Drives or Disk

select disk <number>

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  # List Partition

list partition

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  # List Partition

select partition <number>

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  # Shrink by 4 GiB ( = 4096 MiB)

shrink desired=4096

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  # Create new Partition with Unallocated Space

create partition primary size=4096

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  # Format new Partition as NTFS with label

format fs=ntfs label="DATA" quick

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  # List Volume

list volume

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  # Assign Drive letter to new Volume

assign letter=W

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