WD 10TB  My Book Pro Professional RAID Storage  - Thunderbolt USB 3.0 - WDBDTB0100JSL-NESN High-speed performance with up to 350MB/s data transfer rate Dual-drive enclosure with up to 12TB capacity Thunderbolt 2 or USB 3.0 connectivity Two 20 Gb/s Thunderbolt 2 ports for high-speed workflow Two easy-access USB 3.0 device ports on the front of the enclosure Features RAID-optimized 7200-RPM WD Black drives Customizable hardware RAID 0/1 or JBOD Pre-formatted for Mac OS X in RAID 0 mode (Reformatting required for Windows). Apple Time Machine compatible