B&H # OWTB4TB212 MFR # OWCTB2SRT12.0S 12TB Capacity Includes 4 x 3TB Hard Drives SATA III (6 Gb/s) Interface 7200 rpm, 32MB Cache Supports RAID via SoftRAID 5 Software Preformatted in RAID 5 2 x Thunderbolt 2 Ports Read Speed: up to 1,004 MB/s Write Speed: up to 783 MB/s Mac Compatible Questions?