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The virtual disk in question is 400 GB, with an 80 GB C partition and a 320 GB D partition.

If the virtual disk is resized to 500 GB, is it possible to extend the C partition into the new space?

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Yes. No third party software required. I am assuming by virtual disk you mean that this is a virtual machine, and I'm also assuming you are talking about VMware, not Hyper-V. If my assumptions are correct, then...:

  1. Shut down the server that you need to extend the C: drive on
  2. Take a backup of VM, or as a minimum, secure a copy of the VMDKs
  3. Extend the underlying VMDK
  4. Using a gash Win2k3 server, mount the VMDK containing the to-be-expanded C: drive
  5. Use DISKPART to extend the volume (see MS KB325590)
  6. Shutdown the gash VM, un-mount the VMDK
  7. Start up original VM and voila, bigger C: drive
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"gash Win2k3 server"? Where I come from, we don't speak like that in front of ladies or children, whatever we think of the OS. – dunxd Aug 22 '12 at 21:43
Very good!! ;-) – Simon Catlin Aug 26 '12 at 21:29
But seriously, I don't understand what you mean by the term. – dunxd Sep 4 '12 at 9:50

Yes it is, but you will need to use 3rd party software GParted normally does the trick for me.

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I think you need a 3rd party tool since even though you have enlarged the VMDK, the unallocated space is still at the end of the disk, which is not adjacent to C. I think you could use Partition Assistant, and this article could help.

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Fair point - what ever happened to one VMDK, one partition? – Simon Catlin Aug 24 '12 at 22:20

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