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Changing maximum size of a dynamically expanding disk in 2008 R2 HyperV

How, if possible, can I increase the size of a dynamically expanding disk from the original limit set. Let's say I set a dynamically expanding disk maximum size to 40 gig.  Now I've reached 40 gig and I want it to expand to 80 gig. How would I do that? What tools are available for that?  
1 Solution
Shut down the VM. In the Hyper-V Management tools, edit the disk and make it larger. You will also need to expand the partition from within th VM once you start it back up. See the article below for more complete instructions.

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