The Western Digital WD Blue WD20EARZ is a 3.5-inch hard disk drive designed to provide reliable storage for desktop PCs. With a capacity of 2 TB, it offers ample space for your personal files, photos, and software applications, utilizing a SATA-3 interface with 6 Gb/s speeds to ensure steady data flow. This drive operates at a spindle speed of 5400 RPM and includes a 64 MB cache, which helps maintain a consistent transfer rate of up to 175 MB/s. Its physical build is compact, measuring 147 mm in length, 102 mm in width, and 26 mm in height, with a total weight of 450 g, making it a straightforward fit for standard computer chassis. It runs on a dual voltage system of 5VDC and 12VDC, providing the stable power necessary for long-term data retention in a home or office environment.