Thunder Pro A/V RAID Zero FireWire 800, FireWire 400, USB2.0 Interface Enclosure Latest Technology Maglev Ultra Quiet Swappable, Thermo-Regulated Progressive fan with Warning Buzzer for over heating Smart Auto Power Switch in front (automatically turns on/off when drive is plugged in) Latest Custom Oxford 924 chipset, Apple Time Machine Compatible Supports Multi-Stream DV, HDV, DVCPRO HD with Real Time Effects Stackable, Lays horizontal or vertical , Security lock