ioSafe Duo Pro DAS Storage System (5 Year DRS) - 2 x HDD Supported - 24 TB Supported HDD Capacity - 8 TB Installed HDD Capacity - Serial ATA Controller - RAID Supported 0, 1, Concatenation, JBOD - 2 x Total Bays - 2 x 3.5" Bay - 3 USB Port(s) - 1 USB 3.0