Hornettek  GS-3215 Prolinux 3.5-Inch Dual Bay Gigabit NAS Enclosure with Built-in RAID 0/1 Universal fitting for 3.5" SATA I / II HDD device. Hardware Raid functioned with Silicon image Sil5923 chipset 2-Bay Mobile Rack design Smart PWM fan control Smart Power on/off, resume control Supports RAID 0,1,Normal hardware RAID control Supports BT/HTTP/FTP/MetaLink download One Touch Backup from USB devices.