The Western Digital Blue 4TB HDD is a high-performance internal desktop drive designed for use with PCs. With a storage capacity of 4TB, this SATA III hard drive features a 5400 RPM rotation speed and a 64MB cache for efficient data processing. The WD Blue product line from Western Digital is known for reliability and performance, making it a great choice for expanding storage capacity in your computer system. Made in Thailand, this drive is compatible with HDD drive types and offers a form factor of 3.5 inches.