I thin it's the matter of this Patriot disk.
It have to be incompatible with the NUC
Do you know if Kingston SSDNow mSATA 120GB SMS200S3 would be compatible
It is not on the list of compatible msata disk but maybe there is someone who succeeded installing system on this one
We ordered a lot of those NUCs and different discs and encountered the same strange problem with Transcend SSD and not with A-Data or Kingston discs. After a lot of tests I found a problem's cause. On Transcend mSATA SSD (I think the same will be on Your Patriot Pyro) contacts are slightly shifted-off the edge of SSD board and that is a reason. You can see it here:
Probably there is some construction specialty with mSATA socket used in this NUC model. But anyway there is easy solution - simply sand off this edge, press a SSD slightly toward socked during fixing it in NUC and it will work! Here You can see SSD board before and after sanding:
Hope this will help.