Designed for use in 1-8 bay NAS systems within home, SOHO, and small business environments, the 4TB IronWolf 5900 rpm SATA III 3.5″ Internal NAS HDD from Seagate is built to withstand 24×7 operations, or up to 180TB per year / 8760 hours per year. This 4TB drive has been equipped with a SATA III 6 Gb/s interface, a rotational speed of 5900 rpm, a 3.5″ form factor, and a 256MB cache, providing users with an ample storage capacity and data transfer speeds of up to 202 MB/s. The IronWolf also has an MTBF rating of 1.0 million hours, a workload rate of up to 180TB per year, a non-recoverable read error rate of 1 per 10¹⁴, supports 600,000 load/unload cycles, and an annualized failure rate (AFR) of 0.87%. Protection is provided by a limited 3-year warranty.