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Update: created new Windows 10 Pro VM on Parallels 11.2. Downloaded Windows setup files and used Win 8.1 Pro license key. Windows 10 Pro...
Same story here, plus: using Windows Installation Media (iso) on USB drive and selecting USB external device for boot in Parallels preferences....
A correction and more curious information: the "trying to boot from SATA" issue is a problem on only one of my two Mac OS X 10.11.4 Windows 10...
Same exact issue here. Not using Bootcamp. Windows 10 Pro VM running Parallels 11.2 on MacBook Pro 2015 on OS X 10.11.4 (El Cap). Same issue...