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WD Red 4TB 3.5 Inch NAS Internal Hard Drive - 5400 RPM - WD40EFAX

WD Red 4TB 3.5 Inch NAS Internal Hard Drive - 5400 RPM - WD40EFAX

Q: Is this a smr or cmr disk?

This is a SMR Drive. WD##EFRX is CMR (Good for NAS) WD##EFAX is SMR (Bad for NAS)

Q: Why are there two of these on Amazon both exactly the same but different prices? The more expensive one has more reviews.

One is SMR (Shingled Magnetic Recording, the other is not. This SMR version is completely unsuitable for NAS - do not buy it for that purpose. Search online to find the various articles about why SMR technology is entirely improper for NAS, even though Western Digital Red is sold as if it was. WD are being sued in the US to attempt to prevent them doing this - unusually this is not for money but just to block WD so that gives an idea how much of an issue this is. If you have already bought this disk for that purpose, return it and any problems, go down the 'unfit for the purpose for which it was sold/advertised'.

Q: Is this good for nas running cctv?

I use them in my nas although I do not use cctv I cannot see why they would not be ok.

Q: The title of the listing of this product says 4tb but in the spec description it is listed as 3tb. which is it?

Re: Western Digital RED NAS Hard Drives I would be guided by the WD Hard Drive version stated. For Western Digital RED NAS Hard drives it is currently WDxxEFRX, where xx equals the two digit drive size: eg 30 for 3TB, 40 for a 4TB. However, for a 12TB it is normally WD120EFAX. Trust this helps. Regards Ron

Product ID: 195809213

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Details

Digital storage capacity
4 TB
Hard disk interface
eSATA
Connectivity technology
SATA
Brand
Western
Special feature
Portable
Hard disk form factor
3.5

💾4TB massive NAS storage

🔄180 TB/yr workload endurance

⚙️5400 RPM optimized speed

Frequently Bought Together

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

Synology 2-Bay DiskStation DS224+ (Diskless)

Description

🔴 Power Your NAS with Reliability & Capacity That Never Sleeps

PEACE OF MIND WARRANTY - Backed by a 3-year limited manufacturer’s warranty, so you can trust your data is safeguarded long-term.
ENGINEERED FOR NAS MASTERY - Designed specifically for seamless integration in NAS systems with up to 8 bays, ensuring reliable multi-drive performance.
ENERGY EFFICIENT PERFORMANCE - Runs at a power-friendly 4.8 watts, balancing performance with eco-conscious operation to keep your setup cool and efficient.
ENDURANCE THAT WORKS OVERTIME - Supports an impressive 180 TB annual workload rate, perfect for 24/7 small and home office environments without breaking a sweat.
NA SWARE FIRMWARE COMPATIBILITY - Built-in NASware technology guarantees smooth compatibility and enhanced data protection tailored for NAS setups.

The WD Red 4TB NAS Internal Hard Drive (WD40EFAX) is purpose-built for NAS systems up to 8 bays, delivering 4TB of reliable storage at 5400 RPM. With NASware firmware and a robust 180 TB/year workload rating, it’s optimized for continuous 24/7 operation in small and home office environments. Energy-efficient and backed by a 3-year warranty, it’s the trusted choice for professionals demanding dependable, high-capacity NAS storage.

Specifications

Brand	Western Digital
Product Dimensions	2.62 x 14.71 x 10.16 cm; 560 g
Item model number	WD40EFAX
Manufacturer	Western Digital
Series	DISQUE DUR WD RED 4TO 64MO CACHE SATAIII WD40EFAX (NAS STORAGE) 1036
Colour	Red
Form Factor	2.5 in3.5 in
Standing screen display size	24 Inches
Hard Drive Size	4 TB
Hard Disk Description	Mechanical Hard Disk
Hard Drive Interface	eSATA
Wattage	4.8 watts
Hardware Platform	Mac, PC
Are Batteries Included	No
Lithium Battery Energy Content	2 Kilowatt Hours
Lithium Battery Packaging	Batteries packed with equipment
Lithium Battery Weight	2 Grams
Number Of Lithium Ion Cells	5
Number of Lithium Metal Cells	5
Item Weight	560 g
Guaranteed software updates until	unknown

Have a Question? See What Others Asked

Is this a smr or cmr disk?

Why are there two of these on Amazon both exactly the same but different prices? The more expensive one has more reviews.

Is this good for nas running cctv?

The title of the listing of this product says 4tb but in the spec description it is listed as 3tb. which is it?

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