Western Digital 4 TB WD Red SATA III 5400 RPM 64 MB Cache Bulk/OEM NAS Hard Drive WD40EFRX

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Picture Of Western Digital 4 TB WD Red SATA III 5400 RPM 64 MB Cache Bulk/OEM NAS Hard Drive WD40EFRX
Western Digital 4 TB WD Red SATA III 5400 RPM 64 MB Cache Bulk/OEM NAS Hard Drive WD40EFRX
Amazon Price: $279.99 $169.00 You save: $110.99 (40%). (as of October 24, 2014 9:01 am – Details). Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on the Amazon site at the time of purchase will apply to the purchase of this product.

WD Red 4 TB NAS Hard Drive – The next generation of hard drives for home or small office network attached storage systems.

Expanded solutions
Our formula of success has led growth of WD Red into higher capacities and expansion into new 2.5-inch solutions. We now offer a broader, more comprehensive portfolio of NAS hard drives for our customers. It is not just about NAS drives, it is REDvolutionary.
Next-generation experience
Every component, line of code, and product decision was built on our passion and determination to deliver the best NAS experience. The next generation of WD Red hard drives delivers on this promise with massive capacity and NASware 2.0, which further improves drive reliability and protects your data in the event of a power loss or disruption.

Product Features
Exclusive NASware 2.0 technology – Our exclusive technology, NASware 2.0, makes WD Red thrive in the demanding small-NAS environment. By adding WD Red to your NAS system, not only is everything more efficient and reliable, you can better protect your data investment.
3D Active Balance Plus – Our enhanced dual-plane balance control technology significantly improves the overall drive performance and reliability. Hard drives that are not properly balanced may cause excessive vibration and noise in a multi-drive system, reduce the hard drive life span, and degrade the performance over time. (EFRX models only)
The right choice – WD Red is designed specifically for home and small office NAS systems and PCs with RAID.
Enhanced reliability – Since your NAS system is always on, a highly reliable drive is essential. With a 35% MTBF improvement over standard drives, the WD Red drive with NASware 2.0 is designed for the 24×7 environment.
NAS compatibility – Advanced firmware technology built into every WD Red drive, NASware 2.0 enables seamless integration, robust data protection and optimal performance for systems operating in NAS and RAID environments.

The secret is the next-generation technology – WD's next generation NASware 2.0 technology improves NAS storage performance by reducing common hard drive concerns in NAS systems including concerns for things like compatibility, integration, upgrade ability, reliability and cost of ownership that are experienced with a hard drive designed for desktop computers.

Energy efficient and money saving – We keep power consumption low which keeps your NAS system happy and your wallet, too.
Need help? We offer premium support – Every WD Red hard drive comes with our world-class professional support services including a premium dedicated 24/7 support line (available in English, other regional support hours vary).**

** Support outside of normal business hours is available in English only Go to http://support.wd.com for further details.
The WD advantage – WD puts our products through extensive Functional Integrity Testing (F.I.T.) prior to any product launch. On average, each new product goes through 600,000 hours of testing. WD also has a detailed Knowledge Base with more than 1,000 helpful articles. You can also call toll-free support 7 days per week in the U.S. and Canada. See the WD Support site for full details.
Upgrading your drive is easy – WD Acronis TrueImage, available as a free download on the WD Support site, enables you to copy all your data to a new drive so you don't have to reinstall your operating system to get all the benefits of a new drive.

WD-certified packaging – All WD drives purchased from Amazon.com are shipped in WD-certified hard drive packaging. It is designed and fully tested to provide WD products with the highest of safety while in transit. With WD-certified packaging, you can rest assured that your WD hard drive will arrive safely, fully protected, in a non-descript, easy-open package.
Recommended use – WD Red NAS hard drives are recommended for use in home and small office 1-5 bay NAS systems. For systems that use more than 5 bays or are rack mount solutions, please consider WD datacenter hard drives.***

***WD hard drives are designed and tested for use in specific applications and environments. This ensures that your hard drive is compatible with and functions properly in your application. Our hard drives are warranted against defects in materials and workmanship in the system for which they were designed. Use in systems other than for what the hard drive was designed could result in compatibility problems that affect proper function, unrelated to material and/or workmanship defects. For best results, be sure to select the appropriate product for your application by consulting our product spec sheets on our website at www.wd.com or by calling our customer support line where we would be happy to help you through the selection process.
Ideal for: Small NAS environments 1 to 5 bay RAID configurations

Features at a glance Next generation NAS experience with NASware 2.0 and up to a massive 4 TB capacity Most extensive NAS partner compatibility-testing list available* Expanded NAS solutions with 3.5-inch and 2.5-inch form factors Improved drive reliability and data protection in the event of a power loss or disruption Premium 24×7 support

You might also consider:
3.5-inch Internal
Comparison ChartWD BlueWD GreenWD BlackWD RedWD VelociRaptor Solid performance
and reliability for everyday computing. Cool, quiet operation
for efficient eco-conscious computing. Maximum performance
for power computing. The right drive for home
or small office NAS. High-performance storage for power users. Ideal for Family and business computing. Desktop PCs, secondary storage and external drives. Photo and video editing, and maxed out gaming systems. Specifically designed and tested for small office and home office, 1-5 bay NAS systems. Performance enthusiast systems and workstations. Capacity range 80 GB – 1 TB 320 GB – 4 TB 500 GB – 4 TB 1 TB – 4 TB 250 GB – 1 TB Interface SATA 6 Gb/s
PATA 100 MB/s SATA 6 Gb/s SATA 6 Gb/s SATA 6 Gb/s SATA 6 Gb/s Form factor 3.5-inch 3.5-inch 3.5-inch 3.5-inch 3.5-inch Cache 8 MB – 64 MB 64 MB 32 MB – 64 MB 64 MB 64 MB Highest capacity Highest performance Photo/video editing Network Storage Systems

Product Details

  • Product Dimensions: 5.8 x 4 x 1 inches ; 1.4 pounds
  • Shipping Weight: 1.6 pounds
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • Item model number: WD40EFRX
  • Date first available at Amazon.com: September 3, 2013

Customer Reviews

Regular consumer drives in RAID are accident waiting to happen

 August 20, 2012
By Gary E. Peterson
Here is a quote from a review at pcper.com

I’m going to let the cat out of the bag right here and now. Everyone’s home RAID is likely an accident waiting to happen. If you’re using regular consumer drives in a large array, there are some very simple (and likely) scenarios that can cause it to completely fail. I’m guilty of operating under this same false hope – I have an 8-drive array of 3TB WD Caviar Greens in a RAID-5. For those uninitiated, RAID-5 is where one drive worth of capacity is volunteered for use as parity data, which is distributed amongst all drives in the array. This trick allows for no data loss in the case where a single drive fails. The RAID controller can simply figure out the missing data by running the extra parity through the same formula that created it. This is called redundancy, but I propose that it’s not.

Since I’m also guilty here with my huge array of Caviar Greens, let me also say that every few weeks I have a batch job that reads *all* data from that array. Why on earth would I need to occasionally and repeatedly read 21TB of data from something that should already be super reliable? Here’s the failure scenario for what might happen to me if I didn’t:
* Array starts off operating as normal, but drive 3 has a bad sector that cropped up a few months back. This has gone unnoticed because the bad sector was part of a rarely accessed file.
* During operation, drive 1 encounters a new bad sector.
* Since drive 1 is a consumer drive it goes into a retry loop, repeatedly attempting to read and correct the bad sector.
* The RAID controller exceeds its timeout threshold waiting on drive 1 and marks it offline.
* Array is now in degraded status with drive 1 marked as failed.
* User replaces drive 1. RAID controller initiates rebuild using parity data from the other drives.
* During rebuild, RAID controller encounters the bad sector on drive 3.
* Since drive 3 is a consumer drive it goes into a retry loop, repeatedly attempting to read and correct the bad sector.
* The RAID controller exceeds its timeout threshold waiting on drive 3 and marks it offline.
* Rebuild fails.

At this point the way forward varies from controller to controller, but the long and short of it is that the data is at extreme risk of loss. There are ways to get it all back (most likely without that one bad sector on drive 3), but none of them are particularly easy. Now you may be asking yourself how enterprises run huge RAIDs and don’t see this sort of problem? The answer is Time Limited Error Recovery – where the hard drive assumes it is part of an array, assumes there is redundancy, and is not afraid to quickly tell the host controller that it just can’t complete the current I/O request.

Here’s how that scenario would have played out if the drives implemented some form of TLER:
* Array starts off operating as normal, but drive 3 has developed a bad sector several weeks ago. This went unnoticed because the bad sector was part of a rarely accessed file.
* During operation, drive 1 encounters a new bad sector.
* Drive 1 makes a few read attempts and then reports a CRC error to the RAID controller.
* The RAID controller maps out the bad sector, locating it elsewhere on the drive. The missing sector is rebuilt using parity data from the other drives in the array.
*Array continues normal operation, with the error added to its event log.

The above scenario is what would play out with an Areca RAID controller (I’ve verified this personally). Other controllers may behave differently. A controller unable to do a bad sector remap might have just marked drive 1 as bad, but the key is that the rebuild would be much less likely to fail as drive 3 would not drop completely offline once the controller ran into the additional bad sector. The moral of this story is that typical consumer grade drives have data error timeouts that are far longer than the drive offline timeout of typical RAID controllers, and without some form of TLER, two bad sectors (totaling 1024 bytes) is all that’s required to put multiple terabytes of data in grave danger.

The Solution:
The solution should be simple – just get some drives with TLER. The problem is that until now those were prohibitively expensive. Enterprise drives have all sorts of added features like accelerometers and pressure sensors to compensate for sliding in and out of a server rack while operating, as well as dealing with rapid pressure changes that take place when the server room door opens and the forced air circulation takes a quick detour. Those features just aren’t needed in that home NAS sitting on your bookshelf. What *is* needed is a WD Caviar Green that has TLER, and Western Digital delivers that in their new Red drives.

End quote and back to reviewer.
I’ve got 5 of these in a Synology DiskStation 5-Bay (Diskless) Network Attached Storage (DS1512+). It is really a sweet setup.

The Synology software has a S.M.A.R.T. test that can do surface scans to detect bad sectors. I have their Quick Test check every disk daily and the Extended Test set to automatically run on each of the 5 disks every weekend. (The Extended Test takes about 5 hours per disk so I separate the tests by 12 hours.)

Nice hard drives for NAS or storage server with RAID.

 November 29, 2012
By T. Mccleary
If you’re looking at this review, you’re probably in the market for some honkin’ big drives to stuff into a server or a NAS box. These Western Digital “Red” series drives are probably a total waste of money if you’re planning to put them into a regular PC. If you’re not doing a raid array of some kind, then save your money and buy the green or black series drives instead. If you’re looking to set up a raid array of some sort, these are a bargain. They aren’t the fastest drives, but they are rated to run 24×7 serving up data! Their 3 year warranty is above the current industry standard for consumer hard drives.

For my home-made FreeNAS (google it!) NAS/Server, I bought 5 WD Red drives from Adorama (purchased through Amazon) and 1 drive directly from Amazon.

The one drive from Amazon came very well packaged, double boxed in what looks like a WD cardboard box with a shock absorbing cradle. Very well packaged for shipment. Honestly, Amazon has been stellar for packaging boxes for shipment.

The 5 hard drives from Adorama came in a big box which ‘clunked’ when it was tilted. Opening the box revealed some big plastic pillow air strips, and 5 loose smaller boxes. Inside each of the smaller boxes was a few pillows and a factory bagged hard drive. There were not enough pillows in each box to securely cushion the hard drives against rattling around, so there’s a high likelihood of damage in shipment. BAD SHIPPERS! NO DONUT!

Anyway, getting on to the performance of the drives… I’m running 6 drives in a ZFS RaidZ2 array. They are all controlled using an IBM M1015 PCIE 8x SATA 3 controller which has been flashed to be an HBA providing JBOD to the ZFS OS. That’s a lotta acronyms! The speed of the array is quite fast… more than fast enough to saturate a gigabit network. I currently have about 5TB of data stored on the 10TB array.

On to the bad stuff…
One of the drives (I haven’t checked the serial number to see which shipper it came from) is starting to give signs of premature failure after about 70 hours of operation. During a scrub of the data pool, drive DA5 is experiencing unreadable sectors. Luckily ZFS is able to calculate the correct values for the corrupted data, and is busily recreating the data onto another part of the drive. ZFS rocks for data reliability! If the drive does turn out to be bad, I have a WD Green 3TB drive that I can put into the array as a hot swap temporarily until the failed drive can be replaced. *UPDATE* The ZFS scrub just finished, and it repaired 1.53MB of data, with no data loss. Did I mention that ZFS rocks?

Warning/Advice about Data Storage:
Note 1: If you’re going to be using these drives, or any data storage device for that matter, make sure that you take into account that these are highly fragile and delicate devices which can be easily damaged in shipment, or just plain up and fail when you least expect it. You really need to use some sort of redundant array of drives so that if one drive fails, your data doesn’t vanish. In my case, the final configuration is going to be 6 drives in a RaidZ2 (dual parity striping), which means that my data stays intact and accessible even if 2 drives fail simultaneously. Also, there is going to be a 3TB Green drive as a hot spare that can take over for any failed drive in the array. With the hot-spare, my data can survive the loss of 3 drives without losing data (as long as the failures don’t happen all at the same time).
Note 2: Always, always, always have a backup. In my case, I have two external 3TB USB3.0 drives which will be used only for backup purposes. Every so often, I’ll backup the critical data onto the drives and stash them in my locker at work. If you don’t have TrueCrypt, google it and see why your backup removable drives should be using it. If someone steals the drives, they only get the drives and not my data.

I’m giving 5 stars for the drives that work… 1 star for the failing drive… averages to about 4 stars score! I’ll update this review once I have details on how the drives do in a week or so. Currently it ain’t looking too good for drive DA5!

It’s fast, quiet, relatively cool and HUGE.

 August 3, 2014
By Chaleur
On Windows it comes out to 5.45TB. I transferred a little over 2TB to it and average write speed was 110MB/s. Right now it’s just sitting on top of my computer case but after that long transfer I used a temp gun and the surface of the case was 87F and the drive was 101F.


I just purchased a second drive and did some testing on it while blank and uploaded the results under customer images to the right.

NAS Best Friend

 August 18, 2012
By Simon
After about six months of searching for the perfect drive, I finally settled on two of these Western Digital Red 2TB WD20EFRX hard drives. I was ready to purchase HGST enterprise drives, the former Hitachi, but WD came out with these drives just in-time. I wanted to get the 3TB WD30EFRX version for my Synology DS212 NAS, but the price difference didn’t make that much of a sense, and 2TB drives are more than enough for a few years of my home office use. I am very happy that these drives MTBFs are rated at 1,000,000 hours, they use less power, and they are cheaper than other enterprise drives.

Upon receiving, I immediately installed them in my NAS. It took about 15 minutes to install DSM 4 and begin the inspection process. I neither chose Raid 1, JBOD, or SHR, and I took some online advice and created two separate volumes, one on each disk, to have two independent file systems. In this case, you don’t have to worry about rebuilding disk arrays if any drives fail, and you always have a backup present. I was planning on using Folder Sync feature to sync all folders from Disk 1 to Disk 2 every other hour, but I found out this feature only works on two independent Synology Disk Stations; however, you can use automated backup feature to backup data from Disk 1 into Disk 2, and it produces about the same result as Folder Sync does, and it gives you a few more options for backing up system and application files as well.

Synology volume creation took about 7 hours for each drive with automatic bad sector reallocation feature. I later tested each drive with S.M.A.R.T extended test–each took about 4 hours–and I am happy to report that I did not have any bad sectors on either of the drives. That is, the “Reallocated Sector Count” reads zero in S.M.A.R.T report.

The drives are surprisingly quiet. I had an enterprise RE2 500GB in my NAS, and it was thunderstorm loud compared to these. The temperature is also very reasonable. When the drive is resting it is about 31C/88F, and under heavy usage it rises up to 35C/95F. Although these drives speed are only 5000 rpm, I don’t see any difference in file transfer speed. The only downside that I could sense was the startup time from sleep. I feel that compared to my old WD RE2 drive, it takes a good 2 to 5 seconds more for the NAS to come out of sleep each time. Not a deal breaker, but something to consider when you invest in these drives.

I think WD has done a good job with these drives, and they are currently the best on the market for home or home office use. That being said, I still think WD RE4 drives are the best enterprise drives and ultimate in performance; however, if you are looking for a good set of drives for your NAS, and the power consumption and noise are important to you, these WD Red drives will work just fine. Compared to desktop drives, these come with a few enterprise features that come in handy and will save you some time and money down the road.

Beware of "Load Cycle" Issue on 4TB Drives

 November 22, 2013
By Brandon
I ordered 6 of these drives. One arrived DOA.

Beware of the “Load Cycle Issue” with the 4TB version of these drives. The drives are rated at 300,000 lifetime load cycles, and the drives I used in a Netgear ReadyNAS 314 were racking up hundreds of load cycles a day until I disabled the “Idle 3 Timer”. The drives would probably have died quickly at this rate.

I used two of the drives in a Synology DS213+, and it appears the Synology firmware disables the Idle3 timer automatically. Those drives had very few load cycles and had the timers already disabled when I checked them after setting up the Synology.

It is currently unclear if disabling this timer affects your warranty. I used the idle3ctl utility in Linux to disable the timers. On a readynas os 6 unit, you can install this utility by typing “apt-get install idle3ctl” at a root prompt. Read the documentation and understand what you are doing before using this utility. You only have to run the utility once on each drive to disable the timer. The setting is persistent and survives power cycles.

Two running smoothly in the Drobo now

 August 23, 2014
By J. McGaw
I am an absolutely new user of this particular drive. I had five of the 3tB version in my Drobo 5N and, believe it or not, I was running out of protection space and the Drobo complained that the #1 drive should be replaced with something larger. I couldn’t find a 5tB WD Red so I bought the 6tB and when the budget recovers I’ll buy a second to actually gain a bit of actual storage space.

For Drobo users, sticking one of these in the enclosure might be intimidating. 1) the hardware will be slow to recognize and initialize the drive so the indicator will stay “red” for some time — be patient 2) even after the Drobo acknowledges the new drive it may be a few minutes before it starts the rebuild and 3) the most scary thing is the Drobo’s estimate of rebuild time; dashboard started out estimating 251 hours and then jumped to 299 hours(!) but then settled down to 20 hours after maybe 45 minutes of running and then quickly dropped to 17. Way more reasonable.

(later) Well, after approximately 26 hours the data rebuild on the Drobo 5N completed with no complaints from the new 6tB WD Red drive. Of course this means that I will now need to buy a second equivalent drive to install because the Drobo, for its data protection scheme to work its magic, needs to have a #2 drive as large as the #1 to make use of the space. In other words, to gain 3tB of actual extra storage over what I had to begin with (5 X 3tB Red drives) I will need to expand to two 6tB drives along with three 3tB. Maybe I really should consider erasing some media files and keeping fewer hot backups…

(later still) A month has gone by since I put the first of these 6tB drives into my Drobo 5N and my computer budget recovered enough to allow me to buy a second drive. With Drobo’s storage algorithms, adding the first drive didn’t actually yield any increased storage but with the second addition I finally got an extra 3tB of storage. Again, the drive was thrashed pretty well in the 16+ hour data rebuilding process and everything went well. I’m still impressed with WD’s Red and Green drives with 10 or so of them in use the performance has been flawless. With two 6tB and three 3tB drives in the Drobo I’m hoping that my server storage needs will be taken care of for a while. With all of these drives in the tiny Drobo 5N the operating temperature is good despite the small cooling fan and the fan noise is probably the loudest thing about the entire device.

Failure after 3 months, possibly due to power outage

 September 16, 2013
By B. Mack
I ordered 3 of these for used in a qnap nas. One has failed after about 2.5 months – well, sometimes things just happens. So I called their “premium” support number. The gentleman had difficulty with English. Then he tried to hit me up for a credit card to cross ship; told him I couldn’t do that, and he said it was no problem. That was early Friday morning. It’s monday evening and so far I have no indication whatsoever if it has shipped or not. Very frustrating!!!

UPDATE: Replacement drive has arrive on Tuesday (problem reported Friday morning). I’ve replaced it and my QNAP Nas is now rebuilding the raid array. I have also looked through my logs, and found a power failure just prior to the drive failure. Now at least I’ve been able to convince my wife of the need for a UPS, which is now installed. Perhaps they are very sensitive to power fluctuations?

In light of this, I am upgrading my review to 4 start, giving the benefit of the doubt to WD (I know they did have a bad batch at first, but that was purportedly resolved).

I will upgrade yo 5 stars if I have no problems for an extended time.

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