Seagate IronWolf PRO 125 3.84TB, FF 2.5", SATA NAS SSD ZA3840NX1A001, Sequential Read Speeds 545MB/s, Write Speeds 520MB/s, Read 4KB 96,000 IOPS, Write 4KB 30,000 IOPS, Interface SATA 6GB/s, 3D TLC NAND Flash, MTBF 2,000,000 Hours, 05 Years Limited Warranty NAS-optimized Seagate® IronWolf® Pro 125 SSDs—offering blistering performance, power loss data protection, and multi-user workload support capable of 1 DWPD.