It was purchased in 2019 for use on a desktop. I know that NAS is not meant for desktop use, but it is certainly more durable, so I put it on a desktop that was used very little in these 4 years, a total of 120 days of use, and suddenly, without showing any signs of failure, with 100% health in the program and all checks ok, it gave up the ghost. It's a shame because I've been using WD for so many years, but I think it's starting to break down and I'll probably go for Seagate, as they say it's starting to improve, I'm looking at an Ironwolf.

Good disk, I got it for a back up disk, it was working about 1-2 times a month, but it failed after 11 months... unfortunately. It was replaced under warranty with the same one... fingers crossed.

I have had 2 disks connected to my Synology DiskStation DS218J for over 3 months and they have endured over 20 blackouts without any issues. I will immediately install a UPS as a precaution. I am completely satisfied with their durability and performance.

A very good "tool", I've had it for 4 months and it's fast and quiet. So far, I'm quite satisfied with its performance although I think the price is a bit steep.

The product arrived damaged... I sent it back a month ago and still haven't received any notification about what was wrong with it... nor my money back, of course... The response was that they will send it to the company and let me know... for something I didn't even get to use for a minute... UNACCEPTABLE...

The best choice if you have the money, incredible reliability. It does make a little noise at full load, but nothing annoying.

Three were purchased to be used in raid5. No problems appeared, but they only functioned for a month. Speed and noise are as expected for an HDD. They are worth the cost/MB.

I have been using the same three (in number) NAS arrays with ZFS file system for 6 years now, and they have been running continuously for 24/7 for the past 6 years without any issues.

Time will tell about its reliability. So far, its speed and temperature are at satisfactory levels.

I have him on a NAS only with movies and I bought him solely for reliability reasons so as not to lose 3TB of movies out of the blue, as we say in my village. Let's see if he will last for 5 years since I paid a lot for him.

I have put it on a Synology NAS and its speed is impeccable. It doesn't make any noise and I haven't seen the temperature rise.
I still have to see its reliability over time, but no Western Digital drive has disappointed me.

Two of them have been playing flawlessly, 24/7 for 3 years on my Home Server!! I'm getting ready for the corresponding 6TB!!

Update 14/3/2021
They're still going strong, perfect as ever, now joined by 2 corresponding 8TB ones!!!

4 pieces in the 1st NAS for 2 years, no problem.
2 pieces in the new NAS for 1.5 years... no problem.

They have even survived many power outages (pre-UPS) without issue!

I had purchased a pair in April 2016 but a few days ago (August 2016), one of them failed after displaying an error and ultimately not synchronizing in the NAS's RAID1. I sent it back to WD under warranty and am waiting to hear back from them. I hope they will send me a replacement disk.

Update1: The disk was replaced by WD without issue and there is no longer a problem. The replacement process through the warranty was quick and effective.

Update2: September 2019 and they are still functioning in the NAS without any problems.

The first disk they sent me had a problem, so they replaced it.

2. The new disk works great so far, with low temperatures (30-31 degrees idle and 38-40 full) and good speeds (125-135mb/s).

3. I bought it purely for backup and only use it in a case when I need it, so maybe the red was a bit of an overkill for me, but for NAS and servers, the disk is perfect as it is designed for that.

4. I will monitor how the disk performs in the coming months and will update my evaluation in case something happens.

5. 4 stars because the first disk had an issue, and depending on how satisfied I am with the disk in the future, I will increase or decrease the rating.

6. 8/11/18 update: I haven't had any problems with the disk so far, although I use it very little (it's only for backup), so I give it 5 stars and will update if anything happens!

I have two of them on a NAS and they have been playing without downtime 24/7 for about 4 months now. The NAS runs monthly diagnostics. Neither of them has caused any problems. It's still early to judge, of course. Their speed is satisfactory, as promised. The 4-year warranty gives you peace of mind for a long time after purchasing them. You know they will definitely pay off

The disk has been in the home NAS for about a year now - it hosts family data (photos, videos, etc.), work files, and backups of laptops, tablets, and phones. It is particularly quiet and does not produce much heat (30-31C, which is 5-6 degrees lower than the older Hitachi in the same case). I can't say anything about speed because the NAS is low-end anyway. The goal is for it not to create problems over time.

When I bought it, it was the best in terms of features and price. In the future, I plan to replace the old Hitachi with another 6TB WD Red.