LaCie 4TB Rugged RAID 2.5" External Hard Drive, Thunderbolt, USB 3.0 LaCie 4TB Rugged RAID 2.5" External Hard Drive - Integrated Thunderbolt Cable - USB 3.0 Cable (USB 2.0 Compatible) - Removable Cover and Spare - Power Supply - Quick Install Guide - LaCie 3 Year Limited Warranty Capacity: 4TB Internal Storage Media: 2x hard drives Interface: Thunderbolt bus Powered USB 3.0 (USB 2.0 and UAS compatible) Interface Transfer Rate: Thunderbolt: 10Gb/s USB 3.0: 5Gb/s