The WD Red Plus 4TB NAS Internal Hard Drive (WD40EFZX) is specifically designed for Network Attached Storage (NAS) systems, offering a substantial 4TB capacity in a 3.5-inch form factor. Operating at a spindle speed of 5400 RPM and utilizing a SATA 6Gb/s interface, it delivers reliable performance suitable for small to medium-sized business environments. The drive features a 128MB cache to enhance data transfer speeds, providing a buffer for improved read and write operations. Engineered for 24/7 operation, the WD Red Plus is ideal for NAS environments with up to 8 bays, ensuring continuous data access and reliability. It incorporates NASware™ 3.0 technology, which fine-tunes drive parameters to match NAS system workloads for optimal performance and reliability. Additionally, the drive includes features like IntelliSeek, which calculates optimum seek speeds to lower power consumption, noise, and vibration. Backed by a 3-year limited warranty, the WD Red Plus 4TB provides a dependable storage solution for your NAS needs.