Built with the power to handle small- to medium-sized business NAS environments and increased workloads to SoHo (Small Office and Home Office) customers, the 4TB Red Plus 5400 rpm SATA III 3.5″ Internal NAS HDD from WD is made for archiving and sharing, as well as RAID array rebuilding on systems using ZFS and other file systems in NAS arrays with 1-8 bays. This 4TB drive operates using a SATA III 6 Gb/s interface, a 64MB cache, and a rotational speed of 5400 rpm, all of which help to ensure uninterrupted data transfers with a sustained rate of up to 150 MB/s. This drive also features high levels of reliability, with 600,000 load/unload cycles, <1 in 10¹⁴ non-recoverable read errors per bits read, error recovery controls, and 1 million hours MTBF. Also built into this drive are noise and vibration protection and WD’s NASware 3.0 helps increase system compatibility, allowing WD Red Plus drives to be more easily integrated with your existing network infrastructure.