The 4TB Red Plus 5400 rpm SATA III 3.5" Internal NAS HDD from WD is built to handle the workloads of RAID-optimized NAS systems with up to 8 drive bays, including home offices and power users, small to medium businesses, and consumer and commercial NAS systems. This 4TB drive operates using a SATA III 6 Gb/s interface, a 256MB cache, and a rotational speed of 5400 rpm, which all help to ensure uninterrupted data transfers with a rate of up to 180 MB/s. This drive also features high levels of reliability, with 600,000 load/unload cycles, < 1 in 10¹⁴ non-recoverable read errors per bits read, a workload rate of 180TB per year, dual-plane balance control technology, and a 1 million hours MTBF. WD's NASware helps increase system compatibility, allowing Red Pro drives to be more easily integrated with your existing network infrastructure, while noise and vibration protection is provided by Rotation Vibration (RV) sensors.

8TB Storage Capacity (2 x 4TB)    3.5" Form Factor    SATA III 6 Gb/s Interface    256MB Cache    5400 rpm    Data Transfer Speeds up to 180 MB/s    600,000 Load/Unload Cycles    1 Million Hours MTBF    Dual-Plane Balance Control    Noise and Vibration Protection

• 4TB storage capacity
• For RAID-optimized NAS systems with up to 8 bays
• Workload rating of up 180TB per year and 1 million hours MTBF

• Home offices and power users
• Small to medium businesses
• Commercial and consumer NAS systems

Western Digital's exclusive NASware technology fine tunes drive parameters to match NAS system workloads, which helps increase performance and reliability.

Since your NAS system is always on, a reliable drive is essential. WD Red Plus hard drives are designed for systems that operate 24/7, giving users the confidence of knowing they can reliably access their data.

Western Digital partners with a wide range of NAS system vendors for extensive testing to ensure compatibility with most NAS enclosures.

WD Red Plus drives are engineered to use less power (versus previous models) and run cooler, which reduces operating costs and helps reduce heat in thermally challenged NAS boxes.

Despite using less power, the drives have plenty of bandwidth to handle the mixed performance demands of multi-drive NAS systems.

Hard drives that are not properly balanced may cause excessive vibration and noise in multi-drive systems, which could reduce hard drive life span and degrade the performance over time. WD's enhanced dual-plane balance control technology significantly improves balance and increases overall drive performance and reliability.

Western Digital stands behind their NAS storage solutions with the assurance of a limited 3-year limited warranty and world-class support services for hassle-free data storage.

Related Questions and Answers

Q: 1. Do these drives have NASware 3.0 Technology?

A: Yes, on the upper right of the label on the HDD there is text NASware 3.0

Q: 2. What is Retail Kit ? I don't see any difference in spec's between the 4TB offered at $165.72 and the one that is marked retail Kit at $179.

A: Retail drives are drives that are distributed to retail stores and online dealers for sale to the general public. OEM drives are those sold to system manufacturers in large quantity, for inclusion in PCs built for resale: OEM stands for original equipment manufacturer and refers to a company that makes PCs (or other equipment). Retail kits include the drives, installation instructions, mounting hardware, interface cable, warranty card (this may vary from manufacturer to manufacturer and model to model). OEM drives include just the drive.

Q: 3. could you tell me how are the customs fees to Italy (more or less) and if the warranty is valid in Europe?

A: You may calculate your actual shipping options/order totals by adding the items you want to a shopping cart. It will then list the shipping options, descriptions, ETA's and fees to your location. The warranty for this drive is valid in the USA only.

Q: 4. can i know Export Control Classification Number (ECCN) of this item?

A: This # would come from WD itself and should be marked on the HDDs. The ECCN does allow exportation to Australia.

Q: 5. Would the WD Red drive be suitable for DAS enclosure?

A: You can use these drives with a DAS but they are optimized for NAS enclosures.

Q: 6. What's the manufacturer's warranty?

A: The Western Digital 4TB Red WD40EFRX drive includes a three year WD warranty.

Q: 7. Can I use it with desktop as second HDD?

A: Yes you certainly can. However, I use them for data and not gaming. I prefer a black or raptor for gaming....or a spare SSD if you are flush.

Q: 8. Plan to add as backup in a standard desktop case. Perhaps RAID1. Are these red drives appropriate? Wondering if I shouldn't just get a single WD enterprise drive (WD4000FYYZ)

A: This drive is rated very well for NAS devices, which is similar, if not identical, to running as a RAID pair in a desktop box. The drive is sufficient and recommended for that purpose.

Q: 9. I ordered (2)Two 8T Drives in December Will I get these by Next December ?

A: For assistance regarding an order you've placed, please reach out to our customer service department at cs@bhphotovideo.com.

Q: 10. I'm buying multiple drives for a NAS. Why is it cheaper to buy 8 of these individually, and more expensive to buy the retail 8 pack?

A: This is an OEM drive which means that there is no manufacturer warranty. From Western Digital's website: OEM drives are sold without accessories or installation software. OEM drives may not contain a warranty from Western Digital. When Western Digital sells hard drives to OEM computer manufacturers such as Dell, Compaq, Apple, etc, we sell these drives without warranty. The OEM computer manufacturer would include the hard drive under the warranty of the computer system that the hard drive was installed into. For more information about hard drive warranties, please see our Warranty Policy. OEM drives do not have support available through Western Digital Customer Service and Support. If this hard drive came in an OEM system, check back with the OEM manufacturer for any support or possible updates. If you purchased this hard drive from a third party vendor, check back with the place of purchase.