This is a slightly used 8TB - 2 x 4TB Drives 7200 RPM drives Ultra-fast, high-performance Thunderbolt technology Dual Thunderbolt ports Data Transfer Rate up to 327 MB/sec. Daisy-chain up to 6 Thunderbolt compatible devices RAID 0 for maximum performance Time Machine-ready, plug-and-play setup on Mac OS® , with power cord, and 1 cable to transfer data