The Deskstar 7K4000 offers the industrys highest hard drive capacity at an enormous four terabytes of storage with 7200 RPM performance in a standard 3.5-inch form factor. This drive uses Advanced Format, which increases the sector size on HDDs from 512 bytes to 4096 (4K) bytes, thereby increasing capacities & improving error correcting capabilities. The 7K4000 also boasts a 6 Gb/s SATA interface & 64MB cache buffer to balance performance & capacity. The Deskstar 7K4000 is designed to help manufacturers deliver high-performance, high-capacity, power-efficient systems.