As I see, there's always "only" one hdd connected. Could you please try connecting a USB stick (ext4) and attempting multibooting through it? Perhaps we're having a problem with the hdd drive not being recognized for multiboot.But again... I don't have a DB900/920 either... I can't test anything; I can only help theoretically.
.... Pumuckel
.... Pumuckel

Receiver: Gigablue Trio 4K, Gigablue Trio 4K Pro, Gigablue UE 4K, Vu+ solo se 



