WL 4TB 7200RPM 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive (For RAID, NAS, DVR, Desktop PC) w/1 Year Warranty Capacity: 4TB Rotation Speed: 7200RPM 64MB Buffer Size Interface: 3.5" SATA 6.0Gb/s Warranty: 1 Year Warranty from Reseller