The 4TB Red Plus 5400 rpm SATA III 3.5" Internal NAS HDD from WD is built to handle the workloads of RAID-optimized NAS systems with up to 8 drive bays, including home offices and power users, small to medium businesses, and consumer and commercial NAS systems. This 4TB drive operates using a SATA III 6 Gb/s interface, a 256MB cache, and a rotational speed of 5400 rpm, which all help to ensure uninterrupted data transfers with a rate of up to 180 MB/s. This drive also features high levels of reliability, with 600,000 load/unload cycles, 14 non-recoverable read errors per bits read, a workload rate of 180TB per year, dual-plane balance control technology, and a 1 million hours MTBF.

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