PowerVault MD1200: The Dell™ PowerVault™ MD1200 expansion enclosure is optimized to satisfy applications that use lots of capacity and move large amounts of data. It is the first Dell enclosure that allows you to mix and match 2.5 and 3.5 inch drives in a 2-unit, 12-drive solution.
PowerVault MD1220: The PowerVault MD1220 expansion enclosure is designed to support high-performance applications such as e-mail or database applications that store active and frequently changing information. The PowerVault MD1220 is Dell’s energy-efficient modular storage array and the first modular enclosure that can expand to support 192 drives including Solid State Drives (SSDs).