alienware15r2 SSD-2 did not listed when add UEFI boot option

​I have a samsung SSD with win10 in slot SSD-1, and a aigo SSD with DeepinLinux in slot SSD-2.​

​And the bios main panel appears that both of sansung and aigo SSDs are connected with my laptop.​

​So i want to add a UEFI boot option for DeepinLinux installed on SSD-2(aigo), but i can not select SSD-2(aigo) as media driver because it only lists SSD-1(samsung).​

​So why SSD-2(aigo) did not listed here ?​

​Here are several pictures maybe helpful:​