Samsung 990 PRO 4TB NVMe M.2 Internal Solid State Drive - PCI Express 4.0 x4, NVMe 2.0 - M.2 2280 - AES 256-bit Full Disk Encryption - Up to 7450 MB/s Read Speed - Up to 6900 MB/s Write Speed (MZ-V9P4T0B/AM)