One M.2 PCIe SSD, one 2.5" drive. manual here: [URL]  
Hello Dell I have a dell Inspiron 5580 i want to know about m.2 PCIe SSD. which m.2 PCIe SSD generation is better for my laptop.    [IMAGE]  
Dell Inspiron 5580 Which M.2 PCIe SSD-0 is support