For single 3.5" SATA I / II hard drive.Plug & Play USB 2.0 + eSATA combo support SATA hot swap function. Removable drive tray design for multi-drive exchangeability & maintenance capabilities.Fan-less operation with aluminum body cooling & protection plus fine mirror finish exterior. Built-in expandable foot stand and supports vertical position to save space.Compatible to both PC and Mac systems. Built in security slot for security cable kit.