Western Digital 16TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5 - WD161KFGX

These drives make a constant ticking noise once every 5 seconds. This seems to be a feature of the drive, as they continuously proactively scan the media for bad sectors and relocate them before they become unreadable. This in itself is a good thing. What is bad is excessively audible noise this creates. Sitting anywhere close to these hard drives, the periodic clockwork nature of these clicks, every 5 seconds from each drive, it becomes very annoying real fast. I expected 7200 rpm drives to be have more white noise than 5400 rpm drives. Thats fine. A bit louder random head movements while drive is being accessed, I can get used to that. However, I did not expect these to click like a very loud antique clock all day long even when completely idle. If you are buying hard drives for a datacenter, these are probably great. If you are buying them for a NAS box that youll keep far away from sight (and ears) in a separate room in a basement, these should do just fine. If theyll be anywhere near you while you work, constant ticking clock-like noise from these will start driving you nuts real fast.

I already said they are the best....what more do you need?

Been running fine for two years now. After trying two 16 TB Seagate drives that arrived DOA, I decided to try these NAS drives. It looks like the Seagate drives are just too fragile to survive shipping. The new WD Red Pro fired right up and has been writing continuously for 3 hours now. Update: Still working fine after a year. Loses one star for being noisy as hell. It sounds like demons are trying to bash their way out when its busy.

Bought two 18TB drives to upgrade a volume on my NAS which is used primarily as a media server. I have a WD MyCloudPR4100. These drives make so much noise that it can drive you insane. They constantly sound like theyre reading/writing even though no files are being accessed. I suggest if you buy these that you have your server in a closet or somewhere that it cant be heard. I am going to be returning these and instead picked up two 14tb RED drives running at 5400rpms. So far the 14tb drives are just as quiet as the 6tb I had in there.

Worked perfectly

Got my drive today and it runs as expected. I can only say if you have a loud drive then you ordered a knockoff. My Pro drive runs at same noise level as any other drive in my system. My warranty status is perfect 5 years so I ordered another to have on hand which was probably dumb since these will probably outlive warranty by many years. Probable use it to back some lower priority data

It just works.

read and write speed is big improvement compared to wd red plus. put it in my wd mybook duo 2017, raid 1 mode/mirrored.

The price for these was GREAT, I bought a diskless WD PR4100 to put these in and built a 72TB storage device for about half the retail price of a prebuilt unit..

Bought two of these for a mirrored data partition setup in a server. Within maybe 15 minutes they were running noticeably warm and within an hour they were both running hot enough that it was painful to try to keep your hand up against the side of them for more than maybe 10-15 seconds. Shipped and sold by Amazon btw - just cause others had mentioned issues with drives sold by third party sellers. My only other experience with Western Digital 10TB drives was with an external drive (not sure if it was a red drive inside it but....) that failed a little under a year so Im not optimistic about these but they were what was available when we needed them. 4 stars because even though theyre working now, I think that at some point were going to have to swap these drives out even if they dont fail just because of the fact that the whole rig is running that much hotter because of these little branding irons. Thats going to be a pain and take hours of downtime to transfer the data - all of which I wouldnt have to deal with if these ran cooler like they shouldve out of the box. Not sure if they just arent made to handle RAID 1. Ill update the review when/if something fails. Fingers crossed.