Western Digital Red Plus WD40EFPX internal hard drive 3.5 4000 GB Serial ATA III

HDD size: 3.5" | Native Command Queuing (NCQ): Yes | Mean time between failures (MTBF): 1000000 h | Interface: Serial ATA III | Storage drive buffer size: 256 MB | Type: HDD | 24/7 operation: Yes | Noise level (idle): 23 dB | Power consumption (standby): 0.3 W | Weight: 570 g | Component for: NAS | Workload rate limit: 180 TB/year | Operating temperature (T-T): 0 - 65 °C | Width: 101.6 mm | Height: 26.1 mm | Power consumption (idle): 3.1 W | Hot-swap: No | Storage temperature (T-T): -40 - 70 °C | Depth: 147 mm | Operating shock: 70 G | Non-operating shock: 250 G | HDD interface transfer rate: 6 Gbit/s | Advanced Format (AF): Yes | Start/stop cycles: 600000 | HDD capacity: 4 TB | HDD speed: 5400 RPM