Brand: Western Digital (WD) Series: WD Blue Capacity: 4TB Form Factor: 3.5-inch internal HDD Interface: SATA III (6 Gb/s) RPM: 5400 Cache: 256MB Recording Technology: SMR (Shingled Magnetic Recording) Max transfer speed: up to ~180 MB/s Power usage: ~4–5W active (low power design) Operating temperature: 0°C to 60°C Use case: Storage, backups, media files, everyday PC use