So I have six sata and one m.2 on my motherboard (MSI Krait Gaming) I have a Samsung 960 Evo in my m.2 slot this is my main hard drive with windows. Next is sata port one and two theses have two Kingston A400 250gb SSD's in raid 0. Next is ports three and four these have two Weston digital 1tb drives in not in any raid. Now I've plugged in a 1tb drive and a 320gb drive I had laying and the about in to port five and six but my bios can't see them. Both drives work
Ahhhh I see now. Sata port five and six and unavailable if your using an m.2 drive. Thought I'd post the awnser in case some else has this issue