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

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