Akitio Neutrino Thunder Duo with 2TB HDD (1TB x 2) Thunderbolt for lighting fast transfer speeds of up to 10Gbps Comes with 2 Thunderbolt ports, supporting storage and display Pre-installed two HDDs and formatted in MacOS RAID-0. Ready to use out of box. Removable HDD/SSD trays for easy capacity upgrade. Durable, compact and portable. Built-in fan for active cooling