ok, just started clean on a new HP gen 8 microserver => hp part => F9A40A => https://www.hpe.com/h20195/v2/GetPDF.aspx/c04123182.pdf setup bios to ahci support, dont want to use smart array inserted 1 ssd disk installed clean esxi 6.5 on that ssd , used latest build : VMware-ESXi-6.5.0-Update1-5969303-HPE-650.U1.10.1.0.14-Jul2017 created a new host with synology 5.2 to test, see screenshot of the config :  https://www.dropbox.com/s/54toxj4gfn7ya5b/settings.JPG?d