Western Digital Red Plus NAS 4TB 3.5” SATA 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 Packed with power to handle the small- to medium-sized business NAS environments and increased workloads for SOHO customers, WD Red Plus is ideal for archiving and sharing, as well as RAID array rebuilding on systems using ZFS and other file systems. Built and tested for up to 8-bay NAS systems, these drives give you the flexibility, versatility, and confidence in storing and sharing your precious home and work files. Specifications Disk Type HDD NAS External? No Capacity 4TB Rotation Speed 5400 rpm Cache 128MB Transfer Rate up to 175MB/s Interface SATA 3 Compatibility NAS Systems Dimensions 147 x 102 x 26 mm