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Increasing the Disk Space for a Windows 7/Windows 2008 VM

You need to expand an existing disk on a Windows 7 or Windows Server 2008 VMware guest.

Solution

This is done by increasing the size of the vDisk and then using Disk Manager to utilize the larger disk.

  1. Connect to the VMware server using the vSphere client and open the properties for the affected machine. Select the vDisk you need to extend and type a larger number in the “Provisioned Size” field.
    NOTE: if the machine has any snapshots, you will not be able to change the disk size.  You will need to delete the snapshots first.
  2. Log on to the affected machine and run “Computer Management”.  Switch to the Disk Management entry and (if necessary) rescan the disks.  You should see the additional space at the end of the disk, marked as unallocated.  Right-click on the allocated space and choose “Extend Volume”.
  3. Follow the steps in the Extend Volume Wizard;  you can normally just accept the defaults and keep clicking Next.


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