Western Digital
WD WD40EFPX 4TB Red Plus NAS Internal Hard Drive
★★★★★
Reliable NAS Storage for Home and BusinessThe Western Digital WD Red Plus NAS Internal Hard Drive is designed for NAS systems, providing reliable performance for home offices and medium-sized businesses. With CMR technology and a 256MB cache, this drive ensures efficient data storage and retrieva...
$168.23*
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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.
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Overview
Reliable NAS Storage for Home and Business
The Western Digital WD Red Plus NAS Internal Hard Drive is designed for NAS systems, providing reliable performance for home offices and medium-sized businesses. With CMR technology and a 256MB cache, this drive ensures efficient data storage and retrieval.
Specifications:
- Capacity: 4TB
- RPM: 5400 RPM
- Interface: SATA 6 Gb/s
- Cache: 256 MB
- Form Factor: 3.5 inch
- Technology: CMR (Conventional Magnetic Recording)
- Compatibility: NAS systems up to 8 bays
Key Features
Available in capacities ranging from 1-14TB(1) with support for up to 8 bays | (1) 1MB = 1 million bytes, 1GB = 1 billion bytes, and 1TB = 1 trillion bytes. Actual user capacity may be less depending on operating environment.Specific uses: NAS,Business
Supports up to 180 TB/yr workload rate(2) | (2) Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred ✕ (8760 / recorded power-on hours)). Workload Rate will vary depending on your hardware and software components and configurations.
NASware firmware for compatibility
Built for small or medium business NAS systems in a 24/7 environment
3-year limited warranty(3) | (3) MTBF specifications are based on a sample population and are estimated by statistical measurements and acceleration algorithms under typical operating conditions: workload of 90TB/year and drive temperature of 40°C. Derating of MTBF will occur above these parameters, up to 65°C drive temperature. MTBF does not predict an individual drive’s reliability and does not constitute a warranty. Not all products may be available in all regions of the world.
Specifications
Capacity
4TB
Model Name
WD40EFPX
Series
Red Plus NAS
Specific Uses
NAS, Business
Workload Rate
Up to 180 TB/yr
Warranty
3-year limited warranty
Firmware
NASware
Operational Environment
24/7
Pros & Cons
👍 Pros
- Specifically built for small or medium business NAS systems, ensuring optimal performance in multi-drive environments.
- Designed for 24/7 operation, providing continuous reliability essential for network-attached storage.
- Features NASware firmware, enhancing compatibility and integration within NAS enclosures.
- Offers a substantial 4TB capacity, suitable for significant data storage needs within a NAS.
- Supports up to a 180 TB/yr workload rate, demonstrating robust performance for demanding NAS applications.
👎 Cons
- The 4TB capacity, while significant, may not be sufficient for very large enterprise NAS systems requiring higher storage.
- Workload rate is based on specific operating conditions, and performance may vary depending on hardware/software configurations.
- The drive's performance is optimized for NAS environments, potentially not offering peak speed for desktop PC use cases.
- MTBF specifications are estimated and do not predict individual drive reliability, which is a common limitation for all hard drives.
Frequently Asked Questions
What specific types of systems is the WD Red Plus NAS drive designed for?
The WD Red Plus NAS internal hard drive is specifically built for small or medium business NAS systems operating in a 24/7 environment.
What does "NASware firmware" mean for my NAS system?
NASware firmware is designed to enhance compatibility, reliability, and performance within network-attached storage (NAS) systems.
What is the workload rate supported by this 4TB drive?
This drive supports an annualized workload rate of up to 180 TB/yr, indicating its suitability for demanding data transfer operations in a NAS.
Is this drive suitable for a desktop computer, or is it exclusively for NAS?
While it may function in a desktop, this drive is optimized with NASware firmware and designed for 24/7 operation within a NAS system, which is its specific use case.
What is the warranty period for the WD WD40EFPX 4TB Red Plus drive?
The WD WD40EFPX 4TB Red Plus NAS Internal Hard Drive comes with a 3-year limited warranty.
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