https://www.theregister.co.uk/2017/08/08/seagate_nitroises_nytro_with_layers_of_flash/

Seagate has updated two single-layer SSD product lines with 3D NAND, raising capacity fourfold in one case, and demonstrating a single 64TB flash drive at the Flash Memory Summit.

The Nytro 5000 is the next version of Seagate’s XM1440 SSDs. These came in three versions spanning a high endurance to high capacity range with 400GB to 1.92TB capacity and using MLC (2bits/cell) flash. The interface was M.2 NVMe PCIe gen 3 x4 NVMe 1.2, as it is for the 5000.