Did you modify synoinfo.conf (in /etc and /etc.defaults) by any chance? I finally managed to "brute-force" DSM to show that QEMU disk as internal one. It shows as 13th disk (which is over 12 max disk set), which is obviously invalid (for now):       I did force it by just telling DSM to treat all storage devices as internal: # cat /etc.defaults/synoinfo.conf | grep portcfg esataportcfg="0" internalportcfg="0xffffffffff" usbportcfg="0"     However