In the meantime I believe its not only a Enterprise 2016 problem, but a general Anniversary problem.I googled and found under "Anniversary update destroyed partition" some tips. Unfortunately nothing works for me. Any ideas? Im lost, need help! I have a selfbuild PC with two build in HDD's drives "D" and"E". My main OS is R1 1607 (Build 1493.51) on a SSDrive changeable. Now I installed R1 Enterprise LTSB on a second SSD. All is running very well....BUT I have no access to my 2 internal HDD's, "access denied". Going back to my Standar W 10 Pro Anniversary SSDrive now the same situation. No access to the interna HDDs How can this happen? How can I solve this problem? I posted this problem in the Enterprise section but now I know its a general Problem. Please help, thanks in advance.