Will this make an acceptable replacement for a WD40EFRX-68WT0N0 drive? I have a WD DL4100 NAS that already has (4) WD40EFRX-68WT0N0 that I want 2-4 back-up drives for. Can't find online if this will be an exact replacement drive or not, the stickers and product code are different, and I'm still waiting on WD to get back to me. I don't want to miss the deal. Any help on this would be greatly appreciated. Thank you.

You can get the WD Red SMR model if you are using your NAS for periodical back-up. CMR (WD Red Plus) is better for streaming or recording video. SMR is less expensive so you can buy more and scale up that file backup NAS quickly. But again, SMR is best for file back up because it's an infrequent operation.

is this hard drive noisy?

I have 4 of them running in a NAS and no significant noise.

What is the full model number of the 4TB drive?

The full model number of the 4TB drive is WD40EFZX.

WD Elements 16TB USB 3.0 Desktop External Hard Drive WDBWLG0160HBK-NESN Black

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WD Red Plus 4TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s, CMR, 128MB Cache, 3.5 Inch - WD40EFZX

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Available in capacities ranging from 1-14TB with support for up to 8 bays
Supports up to 180 TB/yr workload rate
NASware firmware for compatibility
Small or medium business NAS systems in a 24x7 environment
3-year limited warranty
Retail or OEM packing may vary

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

Overview

Specs

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Technical Information

Storage Capacity: 4 TB
Recording Technology: Conventional Magnetic Recording (CMR)

Drive Performance

Spindle Speed (rpm): 5400
Buffer: 128 MB

Network & Communication

Wireless LAN: No

Interfaces/Ports

Drive Interface: SATA
Drive Interface Standard: SATA/600

Physical Characteristics

Drive Type: Internal
Form Factor: 3.5"
Height: 1"
Width: 4"
Depth: 5.8"
Weight (Approximate): 1.50 lb

Miscellaneous

Environmentally Friendly: Yes
Environmental Certification: RoHS
Device Supported: Storage System

Model
Brand	WD
Series	Red Plus
Model	WD40EFZX

Performance
Interface	SATA 6.0Gb/s
Capacity	4TB
Recording Technology	CMR
RPM	5400 RPM
Cache	128MB

Features
Features	Tackle Intensity with WD Red Plus Packed with power to handle the small- to medium-sized business NAS environments and increased workloads for SOHO customers, WD Red Plus is ideal for archiving and sharing, as well as RAID array rebuilding on systems using ZFS and other file systems. Built and tested for up to 8-bay NAS systems, these drives give you the flexibility, versatility, and confidence in storing and sharing your precious home and work files. For Small or Medium Businesses Stream, backup, share, and organize your digital content with a NAS and WD Red Plus drives designed to effortlessly share content with the devices at your home or business. NASware 3.0 technology increases your drives' compatibility with your existing network and devices. For larger businesses with up to 24 bays, count on WD Red Pro drives to deliver exceptional performance. Exclusive NASware 3.0 Not just any drive will do. Get up to 112TB of capacity in your 8-bay NAS system and with Western Digital's exclusive NASware 3.0 technology, you can optimize each and every drive. Built into every WD Red Plus hard drive, NASware 3.0's advanced technology improves storage performance by increasing compatibility, integration, upgradeability, and reliability. Built for Optimum NAS Compatibility WD Red Plus drives with NASware technology takes the guesswork out of selecting a drive. Optimized for NAS systems, our unique algorithm balances performance and reliability in NAS and RAID environments. Simply put, a WD Red Plus drive is one of the most compatible drives available for NAS enclosures. But don't take our word for it. WD Red Plus drives are a reflection of extensive NAS partner technology engagement and compatibility-testing. WD Red Pro for Big Business If you're looking for heavy duty performance for NAS, WD Red Pro drives deliver exceptional performance for the medium to large business customer with extreme demands.
Usage	For NAS systems

Dimensions
Form Factor	3.5"
Height (maximum)	26.10mm
Width (maximum)	101.60mm
Length (maximum)	147.00mm

Additional Information
First Listed on Newegg	November 03, 2026

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Return for refund within: 30 days
Return for replacement within: 30 days
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WD Red Plus 4TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s, CMR, 128MB Cache, 3.5 Inch - WD40EFZX

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Warranty, Returns, And Additional Information

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Item#: 9SIC8D2MA20661

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Sponsored Products

WD Red Plus 4TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s, CMR, 128MB Cache, 3.5 Inch - WD40EFZX

Learn more about the Western Digital WD40EFZX

Customer Reviews of the Western Digital WD40EFZX

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info