What power states does Windows To Go support?
Windows To Go supports all power states except the hibernate class of power states, which include hybrid boot, hybrid sleep, and hibernate. This default behavior can be modified by using Group Policy settings to enable hibernation of the Windows To Go workspace.
Why is hibernation disabled in Windows To Go?
When a Windows To Go workspace is hibernated, it will only successfully resume on the exact same hardware. Therefore, if a Windows To Go workspace is hibernated on one computer and roamed to another, the hibernation state (and therefore user state) will be lost. To prevent this from happening, the default settings for a Windows To Go workspace disable hibernation. If you are confident that you will only attempt to resume on the same computer, you can enable hibernation using the Windows To Go Group Policy setting, Allow hibernate (S4) when started from a Windows To Go workspace that is located at \\Computer Configuration\Administrative Templates\Windows Components\Portable Operating System\ in the Local Group Policy Editor (gpedit.msc).