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Getting Started with Windows VDI by Andrew Fryer

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User Profile Disks

In Chapter 1, Putting the V in VDI – An Introduction to Virtualization in Hyper-V, we saw that Hyper-V uses three kinds of Virtual Hard Disks (VHD): Fixed, Dynamic, and Differencing. When we create a personal or pooled collection from a virtual desktop template, the VHD associated with the template is copied to a destination we specify, for example, to an SSD-backed volume on a file server, and a differencing disk is then created from that for each Virtual Desktop (VM) in the collection.

If we then decide to enable UPDs, then each user gets a new differencing disk based on the VM differencing disk and this works because each of the VM differencing disks are identical. This is illustrated in the following figure:

Normally, it ...

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