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

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

Q: Efax suffix means these drives are using smr, right?

Western Digital's complete lack of information regarding this particular drive's use of SMR or PMR would lead me to believe that they are still shipping drives that could use either. (They also produce them from more than one contracted facility) It is my understanding that older versions of this drive use PMR while the more recently manufactured versions will use SMR. If you call customer support to inquire, they will tell you that they are only able to give a definitive answer on whether the drive uses SMR or PMR if you provide them a serial number. This would indicate to me that they have drives with the same product number using both technologies. Also, if you review the specs for the drive on their site, there is absolutely no mention of PMR or SMR. However, if you look at some other WD manufactured drives, such as the Ultrastar DC HC520 12 TB it is clearly marked and identified as a PMR drive.

Q: Can you please confirm if this drive is smr or pmr? drives with smr are inappropriate for in zfs storage pools and may cause loss of data.

SMR. Western digital was hit with a class action lawsuit because they did not advertise this fact. I bought one in 2020 and it failed just past the 2 year mark. Dont buy this drive for a NAS, which is exactly what's its marketed as.

Q: Wd red 8tb is smr or cmr? it is the same "efax" suffix in the model number as 6tb or 4tb, and those are smr

WD does not specify SMR versus CMR. WD has confirmed that the EFAX line has transitioned to SMR for the 2T to 6T drives. That's only for today, and subject to change at any time. Just my opinion, but it seems unlikely to me that all EFAX drives will not transition to SMR eventually. The only thing we know for sure is that WD is super secretive on the subject and will not disclose the information until forced to do so. If CMR is important to you, your choices in the WD brand are Black or Red Pro. Personally, I'm switching my brand loyalty to Seagate for being completely transparent as to which of their drives are CMR and which are SMR.

Q: Why only support for up to 8 bays? What would be the impact of running 12 of these in a single appliance?

Your limitation in drives is variant on your case and software. You can have more than 8 bays if you know what you are doing. Personally I run a Plex server and have 28 bays among 3 servers linked and raided to be able to lose 3 drives without losing data. You can literally buy all the hardware on Amazon and build it yourself. Software I use is a lifetime license from StableBit Drive Pool.

Product ID: 184445581

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Details

Digital Storage Capacity
4 TB
Hard Disk Interface
Serial ATA-600
Connectivity Technology
SATA
Brand
Western
Special Feature
Portable
Hard Disk Form Factor
3.5 Inches

⚡5400 RPM energy-efficient spin

💾4TB massive storage

🔗SATA 6 Gb/s ultra-fast interface

Description

💼 Power your NAS like a pro — storage that works as hard as you do!

MASSIVE 4 TB CAPACITY - Store, archive, and share your critical files effortlessly with a spacious 4TB mechanical hard drive designed for personal and home office use.
PEACE OF MIND WARRANTY - Backed by a 3-year limited warranty, ensuring your investment is protected and your data stays secure.
EFFICIENT 5400 RPM SPEED - Balanced rotational speed delivers quiet, energy-efficient operation without compromising on performance for daily workloads.
ROBUST WORKLOAD HANDLING - Supports up to 180 TB/year workload rate, perfect for heavy data transfer demands and continuous NAS operation.
OPTIMIZED FOR NAS PERFORMANCE - Engineered with NASware firmware to seamlessly integrate with up to 8-bay NAS systems, ensuring smooth, reliable data management.

The Western Digital 4TB WD Red NAS Internal Hard Drive (WD40EFAX) is a 3.5-inch SATA 6 Gb/s HDD designed specifically for personal and home office NAS systems. Featuring 5400 RPM rotational speed, 256MB cache, and NASware firmware, it supports up to 8-bay configurations and handles up to 180 TB/year workload. This drive offers reliable, energy-efficient storage with a 3-year limited warranty, making it an ideal choice for professionals seeking dependable data management and seamless integration.

Specifications

Standing screen display size	24 Inches
Hard Drive	4 TB Mechanical Hard Disk
Brand	Western Digital
Series	WD Red
Item model number	WD40EFAX
Hardware Platform	Mac, PC
Item Weight	1.23 pounds
Product Dimensions	1.03 x 5.79 x 4 inches
Item Dimensions LxWxH	1.03 x 5.79 x 4 inches
Color	Red
Flash Memory Size	4 TB
Hard Drive Interface	Serial ATA-600
Hard Drive Rotational Speed	5400 RPM
Manufacturer	Western Digital
Language	English, English, English, English, English
ASIN	B083XVY99B
Is Discontinued By Manufacturer	No
Date First Available	January 15, 2020

Have a Question? See What Others Asked

Efax suffix means these drives are using smr, right?

Can you please confirm if this drive is smr or pmr? drives with smr are inappropriate for in zfs storage pools and may cause loss of data.

Wd red 8tb is smr or cmr? it is the same "efax" suffix in the model number as 6tb or 4tb, and those are smr

Why only support for up to 8 bays? What would be the impact of running 12 of these in a single appliance?

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