I have recently added 2 m.2 SSD cards to my Alienware 15 R3. However, i see there is another m.2 SSD slot available. This slot is labeled SSD-1 and is smaller than the other two m.2 slots. I believe this is for a half sized M.2 card. I believe it's called a "msata". I would like to add more memory to my laptop, but I can't find a compatible component for this available slot. I would prefer a 1TB to 2TB card. Can someone provide the information I need for compatibility? Maybe a retailer link that has them in stock?