The WD Blue WD40EZAX is a 4TB internal hard drive designed for reliability and performance in office and web applications. With a SATA 6Gb/s interface and a spindle speed of 5400 RPM, this hard drive is ideal for use as a primary drive in desktop PCs. It features a 256MB buffer and a data transfer rate of up to 600 MBps, ensuring smooth operation for your applications. The drive is built with Conventional Magnetic Recording (CMR) technology and includes low power management features, making it an efficient choice for your storage needs. Whether you're storing documents, photos, or videos, the WD Blue hard drive provides ample space and dependable performance.