Specifies whether the PC can use the hibernation sleep state (S4) when started from a Windows To Go workspace.If you enable this setting Windows when started from a Windows To Go workspace can hibernate the PC.If you disable or don't configure this setting Windows when started from a Windows To Go workspace can't hibernate the PC.
Policy path:
Windows Components\Portable Operating System 
Scope:
Machine 
Supported on:
At least Windows Server 2012 Windows 8 or Windows RT 
Registry settings:
HKLM\System\CurrentControlSet\Policies\Microsoft\PortableOperatingSystem!Hibernate 
Filename:
ExternalBoot.admx 
