--- product_id: 184445581 title: "4TB WD Red NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5\" - WD40EFAX" brand: "western digital" price: "€ 574.96" currency: EUR in_stock: true reviews_count: 13 url: https://www.desertcart.hr/products/184445581-4tb-wd-red-nas-internal-hard-drive-hdd-5400-rpm store_origin: HR region: Croatia --- # 5400 RPM quiet performance 4TB massive storage SATA 6 Gb/s ultra-fast interface 4TB WD Red NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX **Brand:** western digital **Price:** € 574.96 **Availability:** ✅ In Stock ## Summary > 💼 Elevate your data game with WD Red — storage that works as hard as you do. ## Quick Answers - **What is this?** 4TB WD Red NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX by western digital - **How much does it cost?** € 574.96 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/184445581-4tb-wd-red-nas-internal-hard-drive-hdd-5400-rpm) ## Best For - western digital enthusiasts ## Why This Product - Trusted western digital brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Robust 256MB Cache:** Boosts data transfer efficiency for smooth multitasking and backups. - • **Massive 4TB Capacity:** Store your entire digital life with room to grow. - • **Silent 5400 RPM Speed:** Whisper-quiet operation perfect for home offices and shared environments. - • **Optimized NASware Firmware:** Seamless compatibility for up to 8-bay NAS systems ensures rock-solid reliability. - • **Enduring 180TB/Year Workload:** Engineered for heavy daily use with a 3-year limited warranty for peace of mind. ## Overview The Western Digital 4TB WD Red NAS Internal Hard Drive is a purpose-built, high-capacity storage solution designed for personal and home office NAS systems with up to 8 bays. Featuring a quiet 5400 RPM spindle speed, SATA 6 Gb/s interface, and NASware firmware, it delivers reliable, efficient performance for heavy workloads up to 180TB per year. With a 256MB cache and a 3-year limited warranty, this drive offers durability and peace of mind for professionals seeking robust, scalable storage. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B083XVY99B | | Additional Features | Portable | | Best Sellers Rank | #104 in Internal Hard Drives | | Brand | Western Digital | | Built-In Media | Internal HDD | | Cache Memory Installed Size | 256 | | Color | Red | | Compatible Devices | Storage System | | Connectivity Technology | SATA | | Customer Reviews | 4.5 out of 5 stars 12,471 Reviews | | Data Transfer Rate | 180 Megabits Per Second | | Digital Storage Capacity | 4 TB | | EU Spare Part Availability Duration | 3 Years | | Enclosure Material | Information Not Available | | Form Factor | 2.5 in|3.5 in | | Global Trade Identification Number | 00718037861036 | | Hard Disk Description | Mechanical Hard Disk | | Hard Disk Form Factor | 3.5 Inches | | Hard Disk Interface | Serial ATA-600 | | Hard Disk Rotational Speed | 5400 RPM | | Hard-Drive Size | 4 TB | | Hardware Connectivity | SATA 6.0 Gb/s | | Hardware Platform | Mac, PC | | Installation Type | Internal Hard Drive | | Item Dimensions L x W x Thickness | 5.79"L x 4"W x 1.03"Th | | Item Type Name | computer-internal-hard-drives | | Item Weight | 560 Grams | | Manufacturer | Western Digital | | Media Speed | 150 MB/s | | Mfr Part Number | WD40EFAX | | Model Name | WD Red | | Model Number | WD40EFAX | | Number of Items | 1 | | Read Speed | 180 Megabytes Per Second | | Special Feature | Portable | | Specific Uses For Product | business, personal | | UPC | 718037861036 071803786033 | | Unit Count | 1.0 Count | | Warranty Description | 3-year manufacturer's limited warranty | ## Product Details - **Brand:** Western Digital - **Color:** Red - **Compatible Devices:** Storage System - **Connectivity Technology:** SATA - **Digital Storage Capacity:** 4 TB - **Hard Disk Description:** Mechanical Hard Disk - **Hard Disk Form Factor:** 3.5 Inches - **Hard Disk Interface:** Serial ATA-600 - **Installation Type:** Internal Hard Drive - **Special Feature:** Portable ## Images ![4TB WD Red NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX - Image 1](https://m.media-amazon.com/images/I/710aEelzoRL.jpg) ## Questions & Answers **Q: Efax suffix means these drives are using smr, right?** A: 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.** A: 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** A: 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?** A: 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Used to Easily Replace Failed Drive in Tivo Roamio *by R***T on November 20, 2019* I considered throwing away my six year old Roamio, model 846500, when it failed. The Tivo wouldn't get past the "Welcome" screen. I fixed the failure in less than an hour with only this WD20EFAX drive, and now have four times the storage as a bonus. The internet knowledge base (and the Weaknees company that's probably the best third party support company for Tivo) says that this failure mode is almost always caused by a failed hard drive. They also recommend this particular model replacement drive. Replacing the drive in Tivo Roamio is extremely easy. It's easy both both physically and because this Tivo will automatically format a new drive (as long as the drive size is 3TB or less) and automatically load all the required Tivo software during boot up. You will, unfortunately, lose any recordings and such drive-kept data as channel lists, scheduled recordings and One-Passes, and so on that were on the old failed drive. There are plenty of decent videos on the internet to show how to do this, but here is a quick procedure to give you an idea of how easy it is: Remove two torx head screws in the back of the unit and use a thin blade such as a common dinner knife to carefully pry up the top of the box. Remove three torx screws that attach the drive's adapter rails to the box and disconnect the drive's data/power cable by pulling the connector away from the drive. Remove the drive mounting rails from each side of the drive, noting their original position, by removing the two torx screws connecting each rail to the drive. Using the new drive, put everything back together. Reconnect the Tivo to your TV system, plugging in the power cable last. Plug in the Tivo's power and let the system boot up. Be patient because it will take some time for the Tivo to automatically format the drive and load all the software needed. Follow the screen guide to set up the Tivo as for a new unit. Your current account with Tivo and any monthly or All-In programming are still in place because the account is based on the box'es ID number which is stored on Tivo's motherboard rather than its hard drive. Voila...You just saved yourself the cost of a new Tivo and upgraded your video storage capacity, as I did! ### ⭐⭐⭐⭐⭐ Western Digital NAS Hard Drive *by C***I on August 30, 2020* This is not your average Western Digital desktop hard drive. The WD Reds are made for heavy duty, high duty cycle use. They are made for use in Network Attached Storage devices. The NAS environment can really torture a hard drive. Especially when it has to support a lot of users and devices. This hard drive is made to be able to function in such an environment. I have a Terramaster NAS in my home network. That system has two Seagate Ironwolf hard drives. It has been flawless in operation. I attached an external hard drive enclosure to the Terramaster to have a backup of all the data. The hard drive enclosure does not come with its own hard drive. You get to choose, depending on your needs. I bought this WD Red hard drive to use as the backup for the Terramaster. I backup the data from the NAS on this hard drive and then store the drive in a safe location. The WD Red has been flawless. It is easily the equivalent of the Seagate Ironwolf. The operation is silent and reliable. I have not had any issues with these NAS hard drives. Yes you can use a regular desktop hard drive for this purpose. A WD Blue caviar hard drive will also work. However, the WD Red is a more robust hard drive. It is more expensive than a regular desktop hard drive. But the reliability and peace of mind are worth it. NAS hard drives will also work on your desktop computer. You can swap out your WD Blue hard drive for this one. You will get added durability and dependability. But it will only be worth the extra cost if your computer is regularly stressed. A one-user desktop PC that gets used for 5 hours per day is not under stress. However, if you have a PC that is used for security monitoring purposes or as a home server, then yes, invest in a more robust hard drive. I love solid state hard drives for their performance and lighter weight when used on a laptop. However, for storage purposes, I still prefer a mechanical hard drive. If I were building my own desktop PC, yes, I would use a NAS hard drive such as the WD Red. But I would not throw out a working WD Blue that comes with a new PC. Evaluate your needs carefully. A data storage system used in a business setting should have robust hard drives. If you are a content creator on Youtube, get at least a four bay NAS storage device and fill those drive bays with WD Reds or Seagate Ironwolves. If you surf the internet, shop online, and basically only consume social media, then a regular PC with a traditional desktop hard drive will be good enough. Highly recommended for NAS Storage systems and heavy-duty desktop use. ### ⭐⭐⭐⭐⭐ 6TB Hard Drive Worked Great! *by T***A on November 20, 2025* Buying anything off Amazon related to computer equipment can be a risk. Great experience from this seller and would buy 4 more hard drives if I had the money. Received it, bench tested and ran with no errors. Formatted and spun right up on my NAS. Great customer service and very responsive! Saving for future purchases 5 Star! ## 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) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/184445581-4tb-wd-red-nas-internal-hard-drive-hdd-5400-rpm](https://www.desertcart.hr/products/184445581-4tb-wd-red-nas-internal-hard-drive-hdd-5400-rpm) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-06-23*