Product Description
The Western Digital WD Red® Pro 4TB internal hard drive (model WD4006FFBX) is an enterprise-class 3.5-inch storage drive engineered to power high-density Network Attached Storage (NAS) servers, commercial RAID arrays, and AI-driven NAS infrastructures (AI NAS). Built to handle demanding 24x7 multi-user operational environments, it utilizes Conventional Magnetic Recording (CMR) technology to ensure consistent, sustained write pipelines without write-amplification drop-offs. Equipped with a 7200 RPM rotational speed, a 256MB cache, and a SATA 6Gb/s interface, it delivers sequential transfer rates reaching up to 217MB/s. The WD4006FFBX incorporates Western Digital's NASware™, OptiNAND™, and ArmorCache™ architectures alongside Time-Limited Error Recovery (TLER) firmware protocols to prevent premature drive dropouts within active RAID groups. Rated for an annual workload of up to 550TB/year and a mean time between failures (MTBF) of up to 2.5 million hours, the drive is validated for systems with an unlimited number of drive bays and is backed by a 5-year limited manufacturer warranty.
Key Features
- Conventional Magnetic Recording (CMR) Architecture: Guarantees predictable, sustained write performance critical for continuous RAID rebuilds and high-throughput content management.
- Scalable for Unlimited Drive Bays: Fully validated and vibration-balanced for deployment across desktop tower NAS units and multi-node enterprise rackmount enclosures.
- NASware™, OptiNAND™ & ArmorCache™ Technologies: Integrated firmware and architecture enhance hardware compatibility, mitigate rotational vibration, and ensure write cache integrity.
- 7200 RPM Performance & Transfers up to 217MB/s: Enterprise spindle speed paired with a 256MB cache delivers fast access times and high sequential throughput for collaborative file sharing.
- RAID-Optimized Time-Limited Error Recovery (TLER): Proactively prevents hard drives from being dropped out of RAID arrays due to extended desktop-level error-recovery cycles.
- Heavy Workload Durability (550TB/year): High endurance rating engineered to support intensive multi-client read/write operations around the clock (24/7).
- Enterprise Reliability (Up to 2.5M Hours MTBF): Engineered with industrial tolerances to deliver long-term data integrity across always-on storage fabrics.
- 5-Year Limited Manufacturer Warranty: Comprehensive enterprise warranty coverage for corporate deployments.
Product Specifications
| Component / Specification | Technical Details |
|---|---|
| Product Category | Enterprise NAS Internal Hard Drive (HDD) |
| Product Series | Western Digital WD Red® Pro |
| Model Number | WD4006FFBX |
| Form Factor | Standard 3.5-Inch |
| Raw Capacity | 4TB |
| Recording Technology | CMR (Conventional Magnetic Recording) |
| Embedded Technologies | NASware™, OptiNAND™, ArmorCache™ |
| Bus Interface | SATA 6 Gb/s (SATA III) |
| Interface Connector | Standard SATA Data & Power |
| Rotational Spindle Speed | 7200 RPM |
| Cache Buffer Size | 256MB |
| Sustained Transfer Rate | Up to 217MB/s |
| RAID Error Handling | TLER (Time-Limited Error Recovery) |
| Workload Rating (WRL) | 550TB/year |
| Mean Time Between Failures (MTBF) | Up to 2.5 Million Hours |
| Chassis Compatibility | RAID-optimized NAS systems with an unlimited number of bays |
| Warranty | 5-Year Limited Warranty |
Environmental, Physical, and Regulatory Data
| Parameter | Specifications |
|---|---|
| Dimensions (L x W x H) | 147 x 101.6 x 26.1 mm (5.79" x 4.0" x 1.03") |
| Unit Weight | 715 g (1.58 lbs) |
| Operating Temperature Range | 0°C to 65°C (32°F to 149°F) |
| Non-Operating Temperature Range | -40°C to 70°C (-40°F to 158°F) |
| Regulatory & Safety Compliance | BSMI, ICES-003/NMB-003, CE, FCC, KC, Maghreb, RCM, UKCA, VCCI, CB-Scheme, TÜV, UL |
| Target Workloads | Multi-bay commercial NAS, enterprise file servers, AI NAS content stores, RAID backup repositories |
Other Available Options
WD Red Plus 2TB 5400RPM 64MB Cache SATA 6Gb/s 3.5" NAS HDD Hard Drive (WD20EFPX)
WD Red Plus 4TB 5400RPM 128MB Cache SATA 6Gb/s 3.5 NAS HDD Hard Drive (WD40EFZZ)
WD Red Plus 6TB 5640RPM 256MB Cache SATA 6Gb/s 3.5 NAS HDD Hard Drive (WD60EFPX)
WD Red Plus 8TB 5640RPM 256MB Cache SATA 6Gb/s 3.5 NAS HDD Hard Drive (WD80EFPX)
WD Red Plus 10TB 7200RPM 512MB Cache SATA 6Gb/s 3.5 NAS HDD Hard Drive (WD100EFGX)
WD Red Plus 12TB 7200RPM 512MB Cache SATA 6Gb/s 3.5 NAS HDD Hard Drive (WD120EFGX)
WD Red Pro 6TB 7200RPM 256MB Cache SATA 6Gb/s 3.5" NAS HDD Hard Drive (WD6006FFBX)
WD Red Pro 8TB 7200RPM 256MB Cache SATA 6Gb/s 3.5" NAS HDD Hard Drive (WD8006FFBX)
WD Red Pro 10TB 7200RPM 512MB Cache SATA 6Gb/s 3.5" NAS HDD Hard Drive (WD103KFBX)
WD Red Pro 12TB 7200RPM 512MB Cache SATA 6Gb/s 3.5" NAS HDD Hard Drive (WD122KFBX)
WD Red Pro 14TB 7200RPM 512MB Cache SATA 6Gb/s 3.5" NAS HDD Hard Drive (WD142KFGX)
WD Red Pro 16TB 7200RPM 512MB Cache SATA 6Gb/s 3.5" NAS HDD Hard Drive (WD161KFGX)
WD Red Pro 18TB 7200RPM 512MB Cache SATA 6Gb/s 3.5" NAS HDD Hard Drive (WD181KFGX)
WD Red Pro 20TB 7200RPM 512MB Cache SATA 6Gb/s 3.5" NAS HDD Hard Drive (WD202KFGX)
WD Red Pro 22TB 7200RPM 512MB Cache SATA 6Gb/s 3.5" NAS HDD Hard Drive (WD221KFGX)
WD Red Pro 24TB 7200RPM 512MB Cache SATA 6Gb/s 3.5" NAS HDD Hard Drive (WD241KFGX)
In accordance with Quebec's Bill 29, our company and its affiliated partners expressly declare that we cannot guarantee the availability of spare parts, repair services, or the necessary information for the maintenance or repair of our products. For any questions regarding availability, please consult the manufacturer's website(s) directly. Learn more
This information does not limit the good working order warranty or other legal warranties. CIPC remains responsible for honouring applicable warranties.