How do reclaim space (unused VM partition) back to the Datastore?

I use vSphere host (5.1.0 Free) with 1 Windows SBS VM (thin provisioning). I'm running low on storage space on the Primary datastore because I have over provisioned it to the VM. Now, I have about 20 GB unused partition on my VM that I'd like to put back to the datastore. How do I accomplish this?
Euan VatcherPrincipalAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The only method is following my EE Article

HOW TO: Shrink a VMware Virtual Machine Disk (VMDK) in 15 minutes

or use VMware Converter, but you've got no space to create the new V2V. VM.
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Euan VatcherPrincipalAuthor Commented:
Thanks for the guide, Andrew. I'll definitely do that once I get the space I need.
Since I do not have the space to move the VM, what I ultimately did was to do (1) defrag, (2) SDelete free space, and (3) punchzero the zero space. This reclaimed about 80 GB.
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