Western Digital WD4005FFBX-SPCAUN0 4TB Red Pro NAS HDD

Name: Western Digital WD4005FFBX-SPCAUN0 4TB Red Pro NAS HDD
Brand: Western Digital
SKU: WD4005FFBX-SPCAUN0

Overview

The Western Digital WD Red Pro WD4005FFBX is a purpose-built NAS hard drive engineered for demanding, always-on storage environments. Spinning at 7200 RPM with a generous 256MB cache, this 4TB drive delivers the kind of sustained throughput that multi-user NAS systems require. Its 550TB/year workload rating places it firmly in the prosumer-to-enterprise category, well above the standard WD Red line, making it a strong fit for businesses running file servers, surveillance systems, virtualized storage, or media archives.

The drive connects via the widely supported SATA 6 Gb/s interface in a standard 3.5" form factor, ensuring compatibility with the vast majority of NAS enclosures on the market. Western Digital's extensive compatibility testing with major NAS vendors like Synology, QNAP, and others adds confidence when deploying these drives in RAID arrays. With no bay-count restriction, the Red Pro scales from compact 2-bay setups to large rack-mounted multi-bay configurations without artificial limitations. For users who need proven reliability and consistent NAS performance at the 4TB tier, this drive checks the key boxes.

Key Features

Available in capacities ranging from 2 to 24TB(1) | (1) 1GB = 1 billion bytes and 1TB = 1 trillion bytes. Actual user capacity may be less depending on operating environment.

For RAID-optimized NAS systems with unlimited number of bays

Rated for 550TB/yr workload rate(2) | (2) Annualized Workload Rate = TB transferred x (8760 / recorded power-on hours). The maximum rated workload is specified for operating at typical temperature of 40C. Workload Rate will vary depending on your hardware and software components and configurations.

Designed to handle the demands of high-intensity 24x7 multi-user NAS environments

Western Digital partners with a wide range of NAS system vendors for extensive testing to ensure compatibility with most NAS enclosures

Specifications

Brand

Western Digital

Series

WD Red Pro

Model

WD4005FFBX-SPCAUN0

Capacity

4TB

RPM

7200

Interface

SATA 6 Gb/s

Cache

256 MB

Form Factor

3.5"

Workload Rating

550TB/year

Bay Support

Unlimited

Designed For

24/7 Multi-User NAS Environments

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Pros & Cons

👍 Pros

7200 RPM speed with 256MB cache delivers strong sequential and random performance for NAS workloads
550TB/year workload rating supports demanding multi-user and multi-application environments
Designed and tested for compatibility with a wide range of NAS enclosures and RAID configurations
No bay count limitation allows use in large-scale NAS deployments

👎 Cons

4TB capacity is on the lower end of the Red Pro lineup, which scales up to 24TB per drive
7200 RPM operation generates more heat and noise compared to 5400 RPM NAS alternatives
SATA 6 Gb/s interface may bottleneck in high-throughput setups compared to newer NVMe NAS solutions
Higher price per terabyte relative to standard WD Red (non-Pro) drives at the same capacity

Frequently Asked Questions

How many drive bays does the WD Red Pro support in a NAS enclosure?

The WD Red Pro is designed for NAS systems with an unlimited number of bays, making it suitable for both small and large multi-bay RAID configurations.

What is the annual workload rating of this drive?

The WD4005FFBX is rated for up to 550TB per year, calculated at a typical operating temperature of 40°C. This makes it suitable for high-intensity, multi-user NAS workloads.

Is this drive compatible with my NAS enclosure?

Western Digital partners with a wide range of NAS system vendors for compatibility testing. The drive uses a standard SATA 6 Gb/s interface and 3.5" form factor, which fits most desktop NAS enclosures.

What RPM and cache does this drive have?

The WD Red Pro 4TB spins at 7200 RPM and has a 256MB cache, delivering faster read/write performance compared to lower-RPM NAS drives.