Improve PC Performance Pair a larger capacity drive with an SSD to give your desktop a performance and storage boost. The SSD maximizes speed of data access, while the WD Blue drive stores up to 6 TB of movies, games, files, applications and more. Specification : Model # Interface Form Factor RPM Class Capacity Cache WD20EZRZ SATA 6 Gb/s 3.5 Inch 5400 4 TB 64 MB