This answer explains why some WD RE drives do not work as a replacement or upgrade for some WD Sentinel products, despite having a similar model number to a supported drive.*END

The Drive Part Number must contain the full description including any suffix (ex: WD2002FYPS-02W3B0) In our main average latency segment with a load of 16T/16Q, we measured an average read latency of 1837.48ms and a write latency of 1224.85ms from the Western Digital RE 4TB. WD4000FYYZ Western Digital 3.5″ hard drive with a storage capacity of 4TB and featuring a SATA interface. WD4000FYYZ-01UL1B1 Western Digital 4TB 7200RPM SATA 6Gb/s 3.5-inch Hard Drive. Comparing latency consistency in our read-only Web Server profile, the Western Digital RE 4TB matches the performance of the Seagate Constellation ES.2 3TB, almost identically. For the entire thread/queue spectrum, the Western Digital RE 4TB kept its latency fairly consistent and in line with the other two drives.No responsibility is taken for the correctness of this information. The listed offers do not constitute legally binding advertising claims of the merchants. The circuit board includes a Marvell 88i9346 controller, as well as 64MB DDR2 of RAM from the Hynix H5PS5162GFR-S6C module. All enterprise HDDs are benchmarked on our enterprise testing platform based on a Lenovo ThinkServer RD240. The ThinkServer RD240 is configured with: Throughout all of our Enterprise Synthetic Workload test, the Western Digital RE 4TB performance is on par with the other enterprise class hard drives we tested: Western Digital RE 2TB and Seagate Constellation ES.2 3TB. The Western Digital RE 4TB did very well under our new 128K test which is designed to show the best case scenario for hard drives. We were able to see the true potential of the larger capacity updated RE, it easily outpaced the other two drives in read performance and showed significant improvement in write performance. It is possible to use hard drives that are not on the list for the DX4000 and RX4100. It is recommended that replacement drives in a RAID configuration match the original drive as close as possible. For example, if the failed drive specifications are 7200 RPM, 64 MB cache, SATA III, 4TB, the replacement hard drive should have the same specifications.

Western Digital RAID Edition (RE) 4TB Enterprise drive takes the RE family to the 4TB capacity limit. The new drive offers a SATA 6Gbps interface with RAID-specific, time-limited error recovery (TLER), dual actuator technology, enterprise build quality to name a few of the features that make the Western Digital RE’s ideal for Enterprise users looking for the fine balance between performance and capacity.If purchasing from a location other than the WD Online Store, please refer to the Drive Part Numbers column.

This drive is ideal for high-capacity data center storage, business-critical environments, high-performance computing, storage area networks (SAN), network attached storage (NAS), direct attached storage (DAS), cloud storage, as well as surveillance systems. With just read activity, the Western Digital RE 4TB had a max response time of 4904.0ms, although with write activity max latency went up to 2833.0ms. Examining the 8K 70/30 average response times, the Western Digital RE 4TB maintains less than 1000ms average response times up through effective queue depth of 24. It spikes to slightly above 1600ms at an effective queue depth of 32. When it comes to data recovery one of the most common problems Western Digital WD4000FYYZ Hard Disk Drive experience is burnt circuit board(PCB). So if you will need to match a replacement PCB, it is important that you note the “ Board Number” of your current circuit board in addition to the hard drive’s “ Model Number“.

Focus on input box

Western Digital offers three Enterprise class drives to their consumers, RE – SATA 6Gbps & 3Gbps, RE – SAS 6Gbps and Xe – SAS 6Gbps. Both the RE classes are a 3.5″ form-factor and range from 250GB to 4TB capacities. The Xe class, which is an Ultra-fast SAS drive, comes in 300GB to 900GB capacities. The Western Digital RE 4TB stands at top of Enterprise class capacities for Western Digital.

The Western Digital RE hard drives have little difference in appearance from their consumer counterparts, except the nice bright yellow label stating “Enterprise Storage.” It is a nice touch just in case you have a bunch of drives in your spare parts box, as it would be difficult at first glance to tell what is Enterprise or what is a Consumer Western Digital Drive. This drive also has RAID-specific time limited error recovery (TLER) that prevents drive fallout that is caused by the extended hard drive error-recovery process, common to desktop drives. Due to the NoTouch ramp load technology this hard drive is equip with, The recording head never touches the disk media ensuring significantly less wear to the recording head and media as well as better drive protection in transit. For a complete list of drives that work as a replacement or upgrade for the WD Sentinel DX4000, RX4100, DS5100, or DS6100 please see the table below:

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The Western Digital RE SATA 4TB provides fast, and reliable performance with the largest available capacity and will give enterprise users a density boost for bulk storage applications. WD hard drives are engineered with Data Lifeguard Tools, a combination of hardware and software that work together to provide you with the best performance and reliability you've come to expect from WD drives. The Data Lifeguard Tools software includes the Acronis True Image WD Edition (ATIWD) which will assist you with your hard drive installation and management; and the WD diagnostic tool which allows you to perform different diagnostic tests on your drive. We get a better idea of the supported features using FinalWire's AIDA64 system report. The table below summarizes the extra information generated by AIDA64 (that is not already provided by HD Tune Pro). Our Enterprise Synthetic Workload Analysis includes four profiles based on real-world tasks. These profiles have been developed to make it easier to compare to our past benchmarks as well as widely-published values such as max 4K read and write speed and 8K 70/30, which is commonly used for enterprise drives. We also included two legacy mixed workloads, the traditional File Server and Webserver, each offering a wide mix of transfer sizes.