Designed for desktops, all-in-one PCs, home servers, and entry level direct-attached storage (DAS) devices, the 4TB Desktop SATA III 3.5" Internal HDD from Seagate offers a storage capacity of up to 4TB and operates using a SATA III 6 Gb/s interface and a 64MB cache, both of which help to ensure uninterrupted data transfers with a sustained data transfer rate of up to 180 MB/s. This drive also features high levels of reliability, with 1 in 1014 non-recoverable read errors per bits read, 300,000 load/unload cycles, a workload limit of 55TB per year, and 2,400 power-on hours. Seagate AcuTrac servo technology helps deliver dependable performance, while free DiscWizard software enables high capacities on legacy PC BIOS systems.