The lockable BPU-340SATA 3 x 5.25" to 4 x 3.5" Bay SAS/SATA 6.0 Gb/s Hot-Swap Cage from iStarUSA provides high-level RAID and high-availability storage in a compact design. It provides additional storage and hot-swap capability to satisfy any application needs. Designed for use with high-end data storage servers or workstations, the storage cage features a high density multi-disk storage backplane that allows four 3.5" SAS/SATA hard drives to be mounted into three standard 5.25" drive bays. It supports RAID 1/0/1+0/5 configuration for high performance or redundancy data application. The 80mm cooling fan allows for excellent front to back vent airflow, while the aluminum construction provides superb heat dissipation required for high-performance SAS/SATA drives. It is ideal for applications like digital audio editing, video editing (SD or HD), security systems, SOHO/SMEs with limited HDD tray and data protection or disk-to-disk backup.