WD Red™ Plus NAS Hard Drive 2TB 3.5" 64 MB Capacity: 2 TB Interface: SATA3 Transfer Rate: up to 180MB/s Form Factor: 3.5 in 5400 rpm
WD Purple Surveillance Hard Drive 6TB 3.5" Capacity: 6 TB Disk Speed (RPM): 5640rpm Cache Size: 256 MB Interface: SATA Form Factor: 3.5 Inch Recording Technology: CMR
WD Red NAS Hard Drive 4TB 3.5" 128 MB, 5.400 rpm Capacity: 4 TB Interface: SATA3 Transfer Rate: up to 180MB/s Form Factor: 3.5 in 5400 rpm
WD Red™ Plus NAS Hard Drive 6TB 3.5" Capacity: 6 TB Cache Size: 128 MB Interface: SATA Disk Speed (RPM): 5400 rpm
WD Red™ Plus NAS Hard Drive 8TB 3.5" Capacity: 8 TB Interface: SATA3 Cache Size: 256 MB Disk Speed (RPM) : 5640rpm