Is this one CMR or SMR?

I'm going to be sarcastic and say read the description. It's right in the title.

Is this drive compatible with the Synology DS414 NAS?

The WD Red 4TB NAS Internal Hard Drive is designed for use in NAS systems with up to 8 bays and includes NASware technology for compatibility, which suggests it should be compatible with the Synology DS414 NAS.

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Sold by Argus Dataworks LLC

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4.5 (58 total ratings)

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WD Red 4TB NAS Internal Hard Drive - 5400 RPM Class, SATA 6Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX

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Options: 4TB

6TB
4TB

Specifically designed for use in NAS systems with up to 8 bays
Supports up to 180TB/yr workload rate
NASware firmware for compatibility
3-year limited warranty
Small and home office NAS systems in a 24x7 environment

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

Overview

Specs

Reviews (387)

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Model
Brand	WD
Series	Red
Model	WD40EFAX
Packaging	Bare Drive

Performance
Interface	SATA 6.0Gb/s
Capacity	4TB
Recording Technology	SMR
RPM	5400 RPM
Cache	256MB

Features
Features	Specifically designed for use in NAS systems with up to 8 bays Supports up to 180 TB/yr workload rate NASware technology for compatibility Small and home office NAS systems in a 24x7 environment
Usage	For NAS systems

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

Additional Information
Date First Available	August 16, 2025

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Return for refund within: 30 days
Return for replacement within: 30 days
This item is covered by Argus Dataworks LLC Return Policy

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WD Red 4TB NAS Internal Hard Drive - 5400 RPM Class, SATA 6Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX

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Item#: 9SIBWBAKK46153

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WD Red 4TB NAS Internal Hard Drive - 5400 RPM Class, SATA 6Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX

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Customer Reviews of the Western Digital WD40EFAX

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info