mSATA drives are getting harder to find now, were only ever available in a max of i think 1TB (samsungs were the best ones that i know of, upto Evo 860) they are also not so cheap now, I fitted a 512GB one to my dads machine i built a few years ago, and it's running just fine but, i do find myself thinking i should have fitted the 1TB model at the time as now it's hardly worth changing.