WD Red Pro 4TB NAS Hard Disk Drive - 7200 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch - WD4001FFSX

I currently have two NAS devices that hold 4 drives each. The last NAS I acquired only had two 1TB drives in it and I wanted to expand that capacity. Looking over the available drives, I found these 4TB drives that were on the list of recommended drives for my NAS so I ordered them.Here is what I found:1. The drives were well packed and protected. Even so, they were easy to remove from the packaging.2. The drives installed easily and were immediately recognized by the NAS and added to system.3. The drives are quiet and their temperature is only about 3 degrees higher than the 1 TB drives when in heavy use.4. Drive access is very good and I am pleased with their performance.All in all, I would highly recommend these drives if you have a need for this type of drive. Keep in mind that a NAS drive has higher ratings than a desk top drive and will usually cost more for that performance and reliability.

These drives are a significant upgrade of the Seagate drives I used previously that would fail if you even looked at them. I have had a few of these for about a year now and they have been rock solid. I just bought 7 more to use in my new NAS. The speed on this drive is great, only thing I could caution is if you are going to be using these in a machine that is within ear shot be careful, they tend to be a little noisy.

Purchased the 2 4TB WD Red Pro drives for my QNAP NAS,1) Drive 1 Failed within 2years and back then they had advanced replacement with a CC hold and this was a decent replacement in good time - Main issue here is the unreliability of the WD RED Pro NAS drives2) Drive 2 Failed 3 months ago and the Warranty replacement for this has been a nightmare, for advance replacement they now charge $25 non-refundable and you have to pay for postage for shipping the drive to them, alternate was to shipping them the faulty drive and once they receive they will then ship a refurbhised drive to me, its been 2 months and absolutely no response from customer service3) Main Issues -a) How their top of the line WD RED PRO Drives are so unreliable that twice I lost every thing on my NAS (fortunately I had backed that up)b) Warranty replacements are a big farce with WD they make it extremely painful and they are as unreliable as their Drives noc) There is "Zero" empathy for potential data loss of their customersd) A company that loses its ethics and has "Zero" empathy for their customers, it is only a matter of time before they have to Shut SHOP, the BIG and MIGHTY have fallen when Customer Service has been poor, WD you might be BIG now but the FALL is coming ...I'm switching to another company for all my hard drive needs from here on ...--Prashanth

I four of these drive on a WD DL4100. I am very happy with the performance of these drives! They are setup as a RAID 10 environment which are Striped and Mirrored.I often write at about 109 MB Per Second to the NAS. I can pretty much peg the 1gb Switch when writing drives so in essence I really cant go faster than the speed of the LAN.Very Happy with these drives! I highly recommend!

These Red Pro drives are working well in my Synology 214+ NAS in RAID 1 array. They are noisy and run hot but when you want your data from the NAS it is fed to you instantly! These drives are fast and spin at 7200 RPM. The faster the HDDs the more noise and heat. Enclose in a communications closet only with adequate air flow! Make sure they are cooled well! If you want cooler and quieter drives than a 5400 RPM with the NAS power save shut down enabled would be an option (like WD Red HDDs). I have had no sync problems with the relaxed timeout feature of these NAS drives.

Problem with the box that the drive came in. Other similar drives I ordered had a manufacturer's label over the flap that had to be torn/cut to open the box. This one did not. The HDD and anti-static bag look new, but I suspect (only suspect) that the drive's refurbished.