I found the hiberfil.sys (~1.6GB) but I din't found any setup for Hybernate (at the MINIX Z64W) like e.g. at http://winaero.com/blog/how-to-enabl...and-windows-8/
So, only to be sure, I setup at
Control Panel -> Hardware and Sound -> Power Options => [Choose what the power buttons do] -> Shut down (instead of Sleep)
and done at [Command Prompt (Admin)] (via right mouse button at the start-symbol)
powercfg.exe -h off
which deletes the hiberfil.sys and releases the ~1.6GB....
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