Western Digital Red 4TB 3.5” SATA NAS Internal HDD Key Features 4TB Internal NAS HDD 5400 rpm Rotation Speed Designed for RAID-optimised NAS Systems SATA 3 Interface 3-Year Limited Warranty Overview There is a leading edge WD Red drive for every compatible NAS system to store your precious data. With 4TB of extra storage, WD Red offers a large amount of space for customers looking to build a NAS solution. Built and tested for personal and home NAS systems with up to 8-bays, these drives pack all the punch you need in one powerhouse unit for storing, archiving, and sharing. With WD Red, you are ready for whatever is next. Specifications Disk Type HDD NAS External? No Capacity 4TB Rotation Speed 5400 rpm Cache 256MB Transfer Rate up to 180MB/s Interface SATA 3 Compatibility NAS Systems Dimensions 147 x 102 x 26 mm