Extending / Shrinking the size of a Hyper-V VM Disk & Windows Guest Operating System


A short tutorial on shrinking a Microsoft Windows Server Hyper-V 2012 (R2)  VM virtual disk and Windows Guest Operating System.

Note that these actions are applicable on Windows Server 2012 (r2) and Windows 8/8.1 But should also work with Windows 7 and Server 2008 (r2) guest OS in a similar fashion. This tutorial will cover the shrinking aspects of a VM virtual disk and guest operating system, extending a disk works in a same manner. (When extending, first start at extending the VM disk, then the OS)

1) Open Hyper-V Manager, Select a VM and open the Console.
2) Right click on the Start Button (windows) and select ‘Disk Management’.
3) Select the volume you would like to shrink, and click on ‘Shrink Volume…’
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4)  Define the amount of MB’s to which you would like to reduce the volume with.

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5) Click ‘Shrink’ and note the ‘unallocated’ free disk space.

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6) Shutdown the VM.

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7) Edit the ‘Settings…’ of the VM.

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8) Select the corresponding Hard Drive. Click ‘Edit’

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9) Click ‘Shrink’

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10) Select the New VM Disk Size. (NOTE: This is the total disk size. Not the amount you would like to reduce with)

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11) Click Finnish.

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The VM virtual disk and the Guest OS volume are now reduced in size.