Reducing Hard Disk allocation for vm server

I accidentally increased the allocation for hard disk 1 by an additional 100gb that I had intended to use for hard disk 2.  How to decrease the allocation for HD1 so that I can use that space for HD2.  The space on hard drive 1 (c: drive/server o.s.) is still unallocated within the Windows server OS storage management.
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Solution provided in 37735646. This is the VMware recommended solution.
I recommend using vOptimizer Pro:

(Free Software)
keyosdAuthor Commented:
I've requested that this question be deleted for the following reason:

There really is no utility to accomplish this, there is only converting the entire virtual machine.  Shame on VMWare.
keyosdAuthor Commented:
vmware's solution is simply a conversion.
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