The MDD 20TB 7200RPM 256MB Cache SATA 6Gbps 3.5" Internal NAS Hard Drive is a high-performance hard disk drive designed for use in network-attached storage systems. With a storage capacity of 20TB and a cache size of 256MB, this hard drive offers fast data transfer rates and reliable data storage. It is compatible with PCs and comes in a 3.5-inch form factor, making it suitable for desktop use. The drive is manufactured by MDD, a trusted brand known for producing quality storage solutions, and is backed by a 5-year manufacturer warranty for added peace of mind.