WD WD30EFAX 3TB Red 3.5″ IntelliPower SATA3 NAS Hard Drive – Total Capacity: 3TB – Recording Technology: SMR – Interface: SATA 6Gb/s – Form Factor: 3.5″ – Advanced Format – Interface Transfer Rate: Up to 180 MB/s – Cache: 256MB – Performance Class: 5400 RPM – MTBF: 1,000,000 Hours – 3 Years Limited Warranty