The Samsung 860 PRO and 860 EVO SSDs come in 2.5-inch, mSATA, and M.2 form factors, employing a new MJX controller and 64-layer V-NAND flash memory. The available capacities are 250 GB, 500 GB, 1 TB, 2 TB, or 4 TB.
https://www.notebookcheck.net/Samsung-860-PRO-and-860-EVO-SSDs-now-available.279870.0.html