This is a Netfinity NetBAY22. A single unit t supports up to seven Netfinity EXP10 storage units for massive data storage solutions. In addition, multiple NetBAY22 units can be placed side by side to handle future growth capacity.You get enhanced security with a lockable front door, rear cover and side panels, you can create a more secure networked environment. Large disk storage capacities can be achieved by installing multiple Netfinity EXP10 units in the cabinet to support mission-critical applications, using Netfinity shared-disk cluster configurations. This NetBAY22 is designed for Netfinity 3500, Netfinity 5000, Netfinity 5000 Rack Mounted models, Netfinity 5500, Netfinity 5500 Rack Mounted models, Netfinity 5500 M10, Netfinity 5500 M10 Rack Mounted models, Netfinity 7000 M10 Rack Mounted models, PC Server 325 Pentium II models, PC Server 325 Rack Mounted Pentium II models, PC Server 330 Pentium II models.