The 4 Gbps ready IBM System Storage EXP810 Storage Expansion Unit machine offers a 16-bay disk enclosure for attachment to selected DS4000 Midrange Disk Systems, with up to 4.8 terabytes (TB) physical capacity per expansion unit using sixteen 300 GB disk drives. The EXP810 Storage Expansion Unit is designed to accommodate 2 Gbps Fibre Channel Enhanced Disk Drive Modules (E-DDM), as well as 4 Gbps Fibre Channel Enhanced Disk Drive Modules (E-DDM), or 4Gbps Serial ATA Enhanced Disk Drive Modules(E-DDM). Supports redundant (AC) or (DC) power and cooling modules, and ESM interfaces. The DS4000 EXP810 is available in a 19-inch rack mount package.