The Cavalry Dock is the easiest and most cost-effective way to consolidate the storage of any two hard drives (included). This two-bay, hot-swappable USB 2.0 dock is perfect for combining your odd-capacity drives into one Spanning device, just insert any two 2.5 or 3.5 SATA drives.Your new volume will be read as one drive with the combined capacity when set to Spanning (BIG). BIG/JBOD settings are easy to change as well with a flip of the switch. Your extra hard drives can finally be put to good use with this versatile dock. With no clumsy covers to unscrew or disassemble, your hot-swappable drives are always accessible and well-ventilated, without a noisy fan. With the USB 2.0 interface and stable, compact base, the Cavalry Dock is perfect for your home or office desktop computer.