Note: This bug is displayed in read-only format because
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See http://go.microsoft.com/fwlink/?LinkId=260709
This functionality is new to Hyper-V in Windows Server 2012 or Windows 8 and is designed to differentiate (security-wise) between instances of a VM that were generated using the exact same disk image / snapshot.
The implementation is based on a new hypervisor's device, that returns a 128-bit, cryptographically random integer value identifier that will be different every time the virtual machine executes from a different configuration file—such as executing from a recovered snapshot, or executing after restoring from backup.