Can't install windows technical preview UPDATE on a virtual hard drive with preview already installed
i gave thought , think difference when using client hyper-v, client there handle stuff external machine expansion of virtual disk (in case of dynamic vhd/vhdx). perhaps "block" arose such situations.
anyways, have feeling might have made missteps in attaching vhdx virtual machine in hyper-v (there's need "repair" installation can boot in hyper-v instead of direct boot menu - more here: http://blog.davidbarrett.net/archive/2013/10/19/upgrading-windows-8-boot-to-vhd-to-windows-8.1ndashstep-by.aspx).
i'm going re-do "repair" (make different selection in menu), report again when can.
update: tried reinstalling win 10 using hyper-v on vhdx , still not update (0x80070003). gave up, formatted vhdx , installed scratch. update applied.
shut down on hyper-v , restarted - boot menu came , boot new build after devices set up.
so, i'm not sure if initial selection of repairing boot caused breakage, or process of troubleshooting in-between broke stuff (i ran automated win update troubleshooter , allowed auto fixes apparently made changes registry), or whatever, nothing worked original native boot vhdx set (not installed via hyper-v).
hopefully new install via hyper-v able update future builds via hyper-v.
Windows 10 Insider Preview > Windows 10 Insider Preview Setup and Installation
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