I installed a windows server 2016 on ESXi 6.7U2 using most of the defaults, including Secure boot with the intention of installing View Composer 7.9. In order to complete the install I had to turn off Secure Boot, install and then turn it back on. during a composer operation, I get Disk Fault errors. After looking at the UFA log and seeing issues with the creation of the disk, spindle.... I made a guess that it was related to secure boot. Turned it off on the composer server and everything works properly.