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Unable to increase hard disk space in Windows 10 virtual machine

APPLIES TO:
  • Parallels Desktop
  • Parallels Desktop for Mac Pro Edition

Symptoms

  • I upgraded from Windows 7/8 to Windows 10.
  • After I increased the hard disk space (by following KB 113972, the Windows disk size still remains the same as it was before increasing it in File Explorer.
  • If I open Disk Management (press Cmd+R combination > type diskmgmt.msc > hit Enter (Return), I see that the last partition on the disk has been increased instead of the C:\ partition:

Cause

Parallels Desktop increases the space of the last partition in a list. This is a default Windows behavior. To increase the size of a desired partition, you should use the Diskpart program.

Workaround


NOTE: Before proceeding with the instructions below we highly recommend you to create a snapshot for data safety purposes.


To add space to the C:\ partition you need to remove the last partition that was extended by Parallels Desktop:

  1. Right-click Start button, then click Command Prompt (Admin).

  2. Open the DISKPART utility by executing the following command:

    diskpart
    

  3. Navigate to the required disk:

    list disk
    select disk <#>
    

    where <#> is the required disk number:

  4. Navigate to required partition and remove it:

    list partition
    select partition <#>
    delete partition override
    

    where <#> is the number of the Recovery partition:

  5. Navigate to the required volume and extend it:

    list volume
    select volume <#>
    extend
    

    where <#> is the C:\ volume number.

  6. When the operation is finished, the following message will be displayed: DiskPart successfully extended the volume.

  7. To make sure the operation was completed successfully, open File Explorer in your Windows virtual machine and check the size of the C: partition.

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PD Pro Edition

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