Western Digital Red Plus 4TB NAS Internal Hard Drive
MPN WD40EFPX · Brand WESTERN DIGITAL (WD) · 3.5"
The WD Red Plus 4TB (WD40EFPX) is a CMR NAS hard drive with 256MB cache, 5400 RPM, and NASware 3.0 firmware, purpose-built for up to 8-bay NAS systems with a 3-year limited warranty
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Overview
The Western Digital Red Plus 4TB NAS Internal Hard Drive (model WD40EFPX) is engineered specifically for network-attached storage environments in home offices and small to medium-sized businesses. Unlike general-purpose desktop drives, the WD Red Plus is purpose-built to operate continuously in multi-drive NAS enclosures, supporting systems with up to 8 bays. At the core of this drive is Western Digital's NASware 3.0 firmware technology, which enhances NAS compatibility, improves integration with RAID configurations, and helps maintain reliable performance over the long term. The drive uses CMR (Conventional Magnetic Recording) technology, ensuring consistent write performance and broad compatibility with NAS operating systems and RAID levels. The drive's 3D Active Balance Plus feature uses dual-plane balance control to reduce vibration and noise in multi-drive enclosures — a key advantage over desktop-class hard drives that lack vibration compensation. This protects drive longevity and keeps acoustics low, with idle noise rated at 23 dBA and seek noise at 27 dBA. With RAID error recovery controls built into the firmware, the WD Red Plus reduces the risk of RAID rebuilds failing due to read errors — a common pain point when desktop drives are used in NAS enclosures. The drive is also designed to handle the thermal demands of always-on NAS environments. Verified Specifications: - Model: WD40EFPX - Formatted Capacity: 4TB - Recording Technology: CMR - Interface: SATA 6 Gb/s - Form Factor: 3.5-inch - Spindle Speed: 5400 RPM - Cache: 256 MB - Internal Transfer Rate: Up to 180 MB/s - Workload Rate: 180 TB/year - MTBF: 1,000,000 hours - Load/Unload Cycles: 600,000 - Non-Recoverable Read Errors: <1 per 10 bits read - Operating Temperature: 0°C to 65°C - Operating Shock (2 ms, read/write): 70 Gs - Non-Operating Shock (2 ms): 250 Gs - Idle Power: 3.1 W | Read/Write Power: 4.7 W | Standby/Sleep: 0.3 W - Dimensions (H × L × W): 26.1 mm × 147 mm × 101.6 mm - Weight: 0.57 kg (approx.) - RoHS Compliant: Yes - Advanced Format (AF): Yes - Native Command Queuing: Yes - Warranty: 3-year limited Backed by a 3-year limited warranty, the WD Red Plus 4TB is a reliable upgrade for any NAS system requiring dependable 24/7 performance, efficient power consumption, and proven NAS-specific firmware
Datasheet
| Warranty | 3 Years |
|---|---|
| Capacity | 4TB |
| Form Factor | 3.5" |
| Interface | SATA |
| Rpm | 5400 |
| Model | WD40EFPX |
| Series | Red |
| Nterface | SATA 6 Gb/s |
| Cache (Mb) | 256 MB |
| Mtbf (Hours) | 1,000,000 |
| Rohs Compliant | Yes |
| Formatted Capacity | 4TB |
| Load/Unload Cycles | 600,000 |
| 12Vdc ±5% (A, Peak) | 1.75 |
| Advanced Format (Af) | Yes |
| Height (In./Mm, Max) | 1.028/26.1 |
| Length (In./Mm, Max) | 5.787/147 |
| Recording Technology | CMR |
| Native Command Queuing | Yes |
| Weight (Lb/Kg , ± 10%) | 1.26/0.57 |
| Workload Rate (Tb/Year) | 180 |
| Width (In./Mm, ± .01 In.) | 4/101.6 |
| Nternal Transfer Rate6 Up To | 180 MB/s |
| Acoustics (Dba) Idle Seek (Average) | 23 27 |
| Non-Recoverable Read Errors Per Bits Read | <1 in 10 |
| Temperature (°C) Operating Non-Operating | 0 to 65 -40 to 70 |
| Average Power Requirements (W) Read/Write Idle Standby And Sleep | 4.7 3.1 0.3 |
| Shock (Gs) Operating, (2 Ms, Read/Write) Operating, (2 Ms, Read) Non-Operating (2 Ms) | 70 70 250 |
