QNAP TR-004, 4 BAY DAS(NO DISK) HARDWARE RAID EXPANSION FOR WIN,MAC,LINUX DEVICE, TWR, 2YR Product Description QNAP TR-004 - hard drive array Device Type Hard drive array Total Array Capacity 0 TB Interface USB 3.0 Installed Devices / Modules Qty 0 (installed) / 4 (max) Supported Drives SATA-300 Built-in Devices Led panel Storage Controller RAID (SATA 3Gb/s) - RAID 0, 1, 5, 10, JBOD Hard Drive No HDD