Western Digital 4TB NAS HDD, 256 MB Cache, 5400 RPM, 3.5″ SATA III – WD40EFPX

The Western Digital 4TB NAS HDD is built to support continuous operation in NAS environments, featuring a 256 MB cache and Advanced Format technology. Designed with Native Command Queuing (NCQ) for efficient data handling, this drive operates quietly at 23 dB while delivering reliable performance with a 1 million-hour MTBF. Ideal for small and medium NAS setups, it supports up to 180 TB/year in workloads, offering both durability and efficiency.

Specifications

• Capacity: 4TB
• Form Factor: 3.5″
• Interface: SATA III (6 Gbit/s)
• Cache: 256 MB
• Drive Speed: 5400 RPM
• Start/Stop Cycles: 600,000
• Native Command Queuing (NCQ): Yes
• Workload Rate Limit: 180 TB/year
• Mean Time Between Failures (MTBF): 1 million hours

Power Consumption

• Idle: 3.1 W
• Standby: 0.3 W

Dimensions & Weight

• Height: 26.1 mm
• Width: 101.6 mm
• Depth: 147 mm
• Weight: 570 g

Operational Conditions

• Operating Temperature: 0 – 65°C
• Non-operating Shock: 250 G

The Western Digital 4TB NAS HDD offers durability and quiet operation, making it ideal for NAS configurations that require constant uptime.