I edited my main post earlier
Edit: Nevermind it says Sata as big as my head, but the pins confused me, shouldn't B key be on the left side of the disk? Or why are they 6?
Ok, found a post from 2015 and solved this issue
The first generation X1 Carbon SSD uses a proprietary interface. It's standard SATA signalling, but with a small form factor connector, sometimes called SanDisk 20+6.. The second and third generations use mSATA and M.2 cards (I forget which order)
So this isn't either mSata nor M.2 Sata is something created by SanDisk that probably died shortly after just like SataExpress
Actually Karadjgne, there are 3 types of m.2 drives M key, B key and M+B key and the first two look like mSata just with less pins on that small part, particularly 5 and 6 instead of 8 like mSata