Western Digital, HDD WD Red Plus WD40EFZZ 4TB/8.9/600 Sata III 128MB (D) (CMR)

NAS & RAID optimized: WD Red Plus is specifically designed for NAS enclosures with up to 8 drive bays - ideal if you're running a small to medium NAS or building a RAID system. Reliability & Continuous Operation: Thanks to NASware firmware and rugged design, it is designed for continuous operation (24/7) - important for NAS servers that run constantly. Compatibility & Energy Efficiency: WD promotes extensive compatibility testing for many NAS systems, and the disk is designed to run energy efficiently and generate less heat - benefits for multi-plate closed NAS enclosures. Performance for home/SMB/power users: It is well suited for home offices, small businesses or users who use NAS as multimedia servers, backup solutions or shared storage. NOTES: This disk is not designed like a typical desktop HDD - it is optimized for NAS/RAID and continuous operation. Desktop drives could be less reliable in NAS environments. Make sure your NAS enclosure or NAS system is compatible with SATA 6 Gbps and 3.5" hard drives. Although it is not a top speed monster at 5400rpm, it offers great value for NAS purposes with 4TB and 180MB/s transfer rate.