Hello, I got Asus B150-Pro m/b and i7-7700K. Even I already have Samsung SSD 1 TB, I would like to add M.2 as primary SSD for OS & Firewall etc. My problem is how to recognize what M.2 storages are "M" key, that my m/b support (based on manual) - shops only describe it as 2242, 2260, 2280, but there is no "M" key statement. Pls help and thanks. Would you be so kind and suggest some model...