Free Express Shipping! WD 1TB Blue SN580 NVMe M.2 Internal SSD 1TB Total Capacity, 2280 M.2 Form Factor, PCIe 4.0 x4 Interface, Up to 4150 MB/s Read Speeds, Up to 4150 MB/s Write Speed, 600TBW Endurance, 1.5 Million Hours MTFB