Sans Digital HDDRACK5 5-Bay IDE/SATA Hard Drive Organizing Rack Simultaneously supports two 2.5-Inch SATA or SATA II mobile hard drives. Equipped with ejectable hard drive trays for hot-swapping. Support synchronized Mirroring (RAID 1) for data backup and stripping (RAID 0) for increase performance. Built-in cooling fan. Hard drive status LED.