Drobo 5D 2TB: Direct Attached Storage -&nbsp; 5 bay array -  2TB storage included with 2 x 1TB hard drives - USB 3 and 2 x Thunderbolt 2 ports (DRDR5A21-2TB) Highly scalable direct attached storage array with 2 x Thunderbolt 2 & 1 x USB 3.0 ports Holds up to 5x 3.5 SATA HDDs. Optional mSATA SSD boosts performance (not included). *Units with hard drives include Seagate IronWolf HDDs Award-winning BeyondRAID automated data protection. Internal battery backup protects against power interruptions Ideal for large media collections and with 64TB volume support. Expandable by adding drives or hot-swapping drives with larger ones. The Drobo chassis is uniquely constructed of metal and the magnetic front cover is easy to install or remove.