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I'm running a virtual machine (Hyper-V) on an Windows Server 2008 R2 64-bit machine. The virtual machine is also a Windows Server 2008 R2 64-bit.

The hard drive is a dynamically expanding virtual hard drive of 45 GB, but when I log in on the machine the hard drive is about 20 GB (the initial size). The drive is almost out of space and does not seem to increase automatically.

EDIT: I forgot to mention that I recently expanded the virtual drive. Thanks for pointing that out.

What should I do?

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I found the answer. Use the Disk Management snap-in from the Computer Management tool to expand the partition within Windows.

EDIT: Yes, yes, I know, it was silly of me to forget that I had to expand the partition on the virtual machine if I expand the virtual drive.

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Yes, and that is totally unrelated to Hyper-V... the same would happen on a physical machine when you run out of the original partition. –  TomTom Jan 14 '13 at 10:49
    
-1 This is not only completely unrelated to Hyper-V's operation, but you didn't mention that you resized the VHD. The VHD is either not Dynamically Expanding or you choose to configure a partition within the VHD less than the maximum size of the VHD. –  Chris S Jan 14 '13 at 13:54
    
I edited the question. –  Peet Brits Jan 15 '13 at 7:28
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