What is the rotational speed of the WD Red Plus WD40EFPX?

The drive operates at 5400 RPM, balancing performance, power efficiency, and reliability for NAS environments. This speed supports up to 175 MB/s read speeds and is optimized for 24x7 operation in up to 8-bay RAID systems with 180 TB/year workload capacity.

What interface does this NAS HDD use?

It features SATA 6 Gb/s (SATA III, ATA-600) interface for high-speed connectivity in standard NAS enclosures. This ensures compatibility with most SMB NAS systems, delivering transfer rates up to 175 MB/s alongside 128-256 MB cache.

How many NAS bays is it compatible with?

Designed for RAID-optimized NAS systems with up to 8 bays, using NASware 3.0 and CMR technology. Ideal for small to medium businesses handling increased workloads, with support for ZFS and expanded OS compatibility.

What is the workload rating?

Rated for up to 180 TB/year, making it suitable for power users and SMB NAS in 24x7 environments. Combined with 1M hours MTBF, it ensures data integrity and longevity in multi-bay setups.

What are the physical dimensions and weight?

Measures 5.79 x 4 x 1.03 inches (L x W x H) in a 3.5-inch form factor, weighing 600 grams. Fits standard NAS chassis while maintaining power efficiency for rack-mounted or tower deployments.

What cache size does it have?

Cache size is 128 MB or 256 MB, enhancing read/write performance up to 175 MB/s. This improves data access in frequent NAS operations, paired with 5400 RPM for reliable SMB use.

WD40EFPX - WD WD40EFPX 4TB 5400 RPM SATA NAS HDD

Name: WD WD40EFPX 4TB 5400 RPM SATA NAS HDD
Brand: Western Digital
SKU: WD40EFPX
Price: 358 USD
Availability: InStock

WD40EFPX - WD WD40EFPX 4TB 5400 RPM SATA NAS HDD | US IT Hardware

Product overview

The Western Digital WD Red Plus 4TB NAS HDD (model WD40EFPX) is a 3.5-inch SATA 6Gb/s internal hard drive designed for small to medium business (SMB) NAS systems. It features 5400 RPM rotational speed, up to 175 MB/s read speed, and a cache size of 128 MB or 256 MB, enabling reliable performance in RAID-optimized environments with up to 8 bays. NASware 3.0 technology optimizes compatibility and sustained operation, supporting a 180 TB/year workload rate. With 4TB capacity, it handles increased data storage needs for power users and SMBs, including expanded OS support and ZFS. Physical dimensions are 5.79 x 4 x 1.03 inches, weighing 600 grams. Ideal for 24x7 NAS workloads, it uses CMR technology for consistent data integrity in multi-bay setups. Procurement teams benefit from its power efficiency and reliability in home offices, consumer NAS, and commercial applications requiring robust data protection and sharing.

4TB capacity, NASware 3.0 for 8-bay RAID NAS
5400 RPM, 175 MB/s read, 128-256 MB cache
SATA 6 Gb/s interface, 180 TB/year workload
CMR tech for SMB 24x7 reliability, 1M MTBF
3.5-inch form factor, power-efficient design
ZFS/OS compatible for versatile NAS deployment

Expedited and overnight shipping options are available at checkout, priced by destination and service.
Purchase orders accepted from qualified institutions.
Refunds within 14 days and replacements within 30 days of delivery with an RMA (25% restocking fee on customer-initiated returns), and every part carries our Standard 30-Day Warranty - see our return policy or contact US IT Hardware.

Featuring

Read/Write Power
Manufacturer part #	WD40EFPX
Brand	Western Digital
Condition	New
Model	WD40EFPX
Capacity	4 TB
Heatsink	No
Idle Power	Not found in search results
Technology	NASware 3.0
Product Line	WD Red Plus
Product Type	NAS Internal Hard Drive HDD
Workload Rate	up to 180 TB/year

Compatible systems

Optimized for NAS systems with up to 8 bays; no specific OS or server models listed

Generic NAS Systems
Model: Up to 8-bay
Form factor: 3.5-inch
RAID-optimized NAS for small/medium business and SOHO

Best for

SMB NAS Systems
Optimized for small to medium business NAS with up to 8 bays and RAID support, delivering 180 TB/year workload and NASware 3.0 for reliable 24x7 operation.
RAID-Optimized Storage
CMR technology ensures data integrity in multi-bay RAID setups, with 5400 RPM and up to 175 MB/s speeds for consistent performance.
Power User NAS
Handles increased workloads in home offices or power user environments, supporting ZFS and expanded OS compatibility with 4TB capacity.
Commercial Data Sharing
Provides power-efficient storage for sharing growing data volumes in consumer/commercial NAS, rated for 1M hours MTBF.

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WD WD40EFPX 4TB 5400 RPM SATA NAS HDD

Product overview

Featuring

Compatible systems

Best for

Frequently asked questions

Details

Shipping, warranty & returns

Customer reviews

Physical Characteristics

Reliability

Interface/Ports

Drive Performance

Weight & Dimensions

Environmental Condition

Read Speed	up to 175 MB/s
Average Seek Time	Not found in search results
Data Transfer Rate	175 MB/s

Weight	600 grams
Cache Size	128 MB or 256 MB
Dimensions	5.79 x 4 x 1.03 inches (L x W x H)

Operating Temperature Range	Not found in search results
Non-Operating Temperature Range	Not found in search results

WD WD40EFPX 4TB 5400 RPM SATA NAS HDD

Product overview

Featuring

Compatible systems

Best for

Frequently asked questions

Details

Shipping, warranty & returns

Customer reviews

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Physical Characteristics

Reliability

Interface/Ports

Drive Performance

Weight & Dimensions

Environmental Condition